These reviews are for geothermal systems that combine the compressor section and blower section into one compact package that is connected to the home's duct system. Our simple rating system
gives each brand a color code and a star rating. If the card is green, then, that is one of the top picks from HvacRepairGuy. If the card is yellow, then, that would be a
budget pick from HvacRepairgGuy. If the card is red, then, the brand is not recommended by HvacRepairGuy. With our air conditioner reviews you can cut through the sales
hype and find value. It truly is like you were taking a repairman shopping with you!
Arcoaire
★★★★☆
Arcoaire, manufactured by International Comfort Products (ICP) under the Carrier Global umbrella, has transitioned its 2026 lineup to utilize R-454B Low-GWP refrigerant. This update focuses on the HCR Ion™ Series, which replaces legacy R-410A models to meet new environmental standards while maintaining high-performance cooling and heating. These systems are engineered and built in the USA at specialized manufacturing facilities in Lewisburg, Tennessee.
Efficiency (EER/COP)
The HCR model features a Closed Loop EER of 27.0 and a COP of 4.6. Based on EER-based category enforcement, this unit is classified as a Premium geothermal system, as it falls within the 20–29 EER range.
Compressor Technology
This model utilizes an advanced variable-speed compressor. By modulating its capacity to match the home's exact needs, the compressor technology directly supports the high 27.0 EER rating and ensures consistent indoor comfort.
Warranty & Reliability
Arcoaire receives a 4-Star rating due to its 10-year parts and 10-year compressor limited warranties. It also includes a 5-year No Hassle Replacement™ limited warranty, which provides a complete unit replacement if the compressor or coil fails within the first five years.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Arcoaire Model Comparison
Premium: HCR Ion™ (R-454B)
Why choose it: Delivers high-efficiency performance with a 27.0 EER and full compliance with 2026 Low-GWP refrigerant standards. Trade-offs: While highly efficient, it does not reach the 30+ EER threshold required for the Ultimate category.
Bosch
★★★☆☆
Bosch has proactively transitioned its 2026 geothermal lineup to the Low-GWP refrigerant R-454B, with the Greensource RP and CDi SM series serving as their flagship residential solutions. These specific models were selected for their balanced approach to modern environmental standards and high-efficiency performance in existing footprints.
Efficiency (EER/COP)
The Bosch lineup delivers strong performance across two tiers. The Greensource RP Series achieves a 29.7 EER (Premium), while the Greensource CDi SM pushes efficiency into the Ultimate category with an EER of 30.5. Both systems maintain high COP ratings, ensuring efficient heating even in colder climates.
Compressor Technology
Both the RP and SM models utilize two-stage scroll compressor technology. This design supports their high EER ratings by allowing the systems to operate at 65-70% capacity during mild weather, significantly reducing energy consumption and noise while providing more consistent humidity control.
Warranty & Reliability
Bosch provides a solid 10-year limited warranty on both parts and the compressor. However, because the brand does not currently offer a dedicated unit replacement guarantee for equipment failure, it receives a 3-star rating under the 2026.3 criteria.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Bosch Model Comparison
Premium: Greensource RP Series (R-454B)
Why choose it: Exceptional Premium-tier EER efficiency and full Low-GWP compliance with R-454B at a more accessible price point than the SM series. Trade-offs: Lacks a unit replacement warranty compared to some competitors in the same tier.
Ultimate Series (30+ EER): Greensource CDi SM (R-454B)
Why choose it: Maximum efficiency levels exceeding 30 EER and enhanced noise dampening through optimized internal components. Trade-offs: Higher initial investment cost and slightly larger footprint for certain tonnage sizes.
Bryant
★★★☆☆
Bryant has updated its flagship geothermal line to the Evolution™ GCA, utilizing Puron Advance™ (R-454B) to meet 2026 Low-GWP requirements. While often perceived as a "premium" alternative to its sister brand Carrier, our data update confirms that Bryant’s specialized "Red Shield" unit replacement warranty does not extend to its geothermal equipment, placing it in our budget-friendly 'Premium' category.
Efficiency (EER/COP)
The Evolution™ GCA provides a Closed Loop EER of 27.0 and a COP of 4.4. This performance level qualifies the unit for a Premium ranking. While it lacks the 30+ EER required for an 'Ultimate' rating, it remains a highly efficient choice for the transition to more environmentally friendly refrigerants.
Compressor Technology
The GCA model features a two-stage scroll compressor. This allows the system to operate at a lower capacity during mild weather to save energy and switch to full capacity only when extreme temperatures demand it, supporting the system's overall efficiency and dehumidification performance.
Warranty & Reliability
This unit receives a 3-Star rating because it offers a standard 10-year parts and 10-year compressor warranty but lacks a unit replacement guarantee. While Bryant’s air-source units often include the Red Shield™ replacement plan, the geothermal line is restricted to a standard repair-or-replace component policy.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Bryant Model Comparison
Premium Series: Evolution™ GCA (R-454B)
Why choose it: Proven two-stage reliability and full compliance with 2026 Low-GWP standards using R-454B. Trade-offs: Lacks the unit replacement protection found in Bryant’s air-source Evolution lines.
Basic Series: Legacy™ GBA (R-454B)
Why choose it: A more affordable entry point into geothermal that still utilizes the new Low-GWP refrigerant. Trade-offs: Lower EER ratings and simplified blower technology.
Carrier
★★★☆☆
Carrier has pivoted its geothermal lineup toward sustainability with the introduction of Puron Advance™ (R-454B). We have selected the Infinity® GCA as the primary representative for this update, as it balances Carrier's most advanced variable-speed communication logic with the industry's shift toward Low-GWP refrigerants, ensuring long-term compliance and parts availability.
Efficiency (EER/COP)
The Infinity® GCA delivers a Closed Loop EER of up to 27.0 and a COP of 4.4. Based on our 2026 enforcement logic, this places the unit firmly in the Premium category. While its Open Loop ratings are significantly higher, the Closed Loop performance provides a realistic benchmark for most residential installations.
Compressor Technology
This model utilizes a high-efficiency variable-speed compressor. This technology supports the Premium EER rating by allowing the system to scale its output down to a fraction of its capacity, maintaining precise temperature control without the energy spikes associated with frequent cycling.
Warranty & Reliability
Carrier provides a 10-year parts and 10-year compressor limited warranty upon timely registration. Because this specific line does not currently include a standard unit replacement guarantee for compressor failures, it is assigned a 3-Star rating. This reflects solid long-term protection but falls short of the "Ultimate" reliability tier.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Carrier Model Comparison
Premium Series: Infinity® GCA (R-454B)
Why choose it: Leading-edge EER efficiency and full Low-GWP compliance with Puron Advance™ refrigerant. Trade-offs: Higher upfront equipment cost and requires Infinity-specific controls for full functionality.
Ultimate Series (30+ EER): Infinity® GCA Inverter
Why choose it: Maximum efficiency via advanced inverter-driven technology, capable of exceeding 30+ EER in specific configurations. Trade-offs: Extremely sensitive to loop design and requires a certified Carrier expert for complex calibration.
Century
★★★☆☆
Century has updated its geothermal lineup with the HZ Series, now utilizing R-454B Low-GWP refrigerant to meet 2026 environmental standards. This transition allows the brand to offer modern, sustainable comfort without sacrificing the heavy-gauge steel construction and reliable scroll compressor technology for which Century is known. These models were selected for their performance-driven engineering and compliance with upcoming refrigerant mandates.
Efficiency (EER/COP)
The Century HZ Series delivers a 27.0 EER and a 4.6 COP in Closed Loop applications. Because the EER falls within the 20 to 29 range, it is categorized as a Premium geothermal system. This efficiency level ensures a significant reduction in seasonal energy consumption compared to standard heating and cooling alternatives.
Compressor Technology
These units utilize a two-stage scroll compressor that can modulate its output to meet the specific thermal demands of the home. This two-speed operation is a key factor in achieving the 27.0 EER rating, as it minimizes energy waste and enhances indoor comfort through superior humidity control.
Warranty & Reliability
Century earns a 3-Star rating because it provides a standard 10-year parts and 10-year compressor warranty upon registration. However, because the brand does not offer a factory-backed unit replacement guarantee for major component failures, it is assigned a Yellow card rather than a Green one.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Century Model Comparison
Premium: HZ Series (R-454B)
Why choose it: Delivers Premium-tier efficiency (27.0 EER) and full 2026 Low-GWP compliance with a reliable two-stage compressor. Trade-offs: Lacks the unit replacement guarantee found on high-end luxury brands.
Ultimate Series (30+ EER): HZ Inverter (R-454B)
Why choose it: Features variable-speed inverter technology to reach Ultimate efficiency levels (30+ EER) for maximum comfort. Trade-offs: Higher initial equipment cost and more complex control systems.
Climatemaster
★★★☆☆
ClimateMaster has led the 2026 industry transition by phasing out R-410A in favor of R-454B low Global Warming Potential (GWP) refrigerants. The Tranquility® 30 (SE) Premier Series was selected for this review as it represents the brand's primary shift toward eco-friendly, high-efficiency residential packaging without sacrificing the reliability of their established digital platforms.
Efficiency (EER/COP)
With a closed-loop EER of 29.6 and a COP of 4.8, the Tranquility® 30 (SE) falls firmly into the Premium category. It narrowly misses the Ultimate tier (30+ EER) but remains one of the most efficient two-stage units on the market, maximizing energy savings for ground-loop applications.
Compressor Technology
This model utilizes a two-stage Copeland UltraTech™ compressor. By running at 67% capacity during part-load conditions, the system maintains steady comfort and superior dehumidification, shifting to 100% capacity only during extreme weather to optimize its high EER rating.
Warranty & Reliability
The system earns a 3-star rating by offering a solid 10-year limited warranty on both parts and the compressor. While highly reliable, the lack of a dedicated unit replacement guarantee (No-Hassle replacement) prevents it from reaching the 4-star green tier.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Climatemaster Model Comparison
Premium: Tranquility® 30 (SE)
Why choose it: Excellent balance of Premium-tier efficiency (29.6 EER) and Low-GWP compliance using R-454B. It is the ideal choice for homeowners wanting modern environmental standards with proven two-stage reliability. Trade-offs: Slightly lower efficiency than inverter-driven models and lacks a lifetime compressor warranty.
Ultimate Series (30+ EER): Trilogy® 45 Q-Mode (QE) Low-GWP
Why choose it: Features industry-leading inverter technology reaching up to 45 EER. It includes Q-Mode for full-time domestic hot water heating at over 500% efficiency. Trade-offs: Significantly higher initial equipment cost and more complex electronic components compared to the Premier series.
Comfort-Aire
★★★☆☆
Comfort-Aire has updated its geothermal lineup to prioritize 2026 environmental standards, centering its current catalog around the ME Series. This model utilizes R-454B Low-GWP refrigerant, representing the brand's shift toward eco-friendly compliance while maintaining the reliability of their established water-to-air platforms.
Efficiency (EER/COP)
The ME Series delivers a closed-loop EER of 19.4 and a COP of 3.7. Under the 2026 GHP classification logic, this unit falls into the Basic category (EER < 20). It is designed for homeowners seeking a balance between modern refrigerant standards and entry-level pricing.
Compressor Technology
This series utilizes a two-stage scroll compressor, allowing the unit to scale its output based on heating or cooling demand. This two-stage operation supports efficiency by running at lower speeds during mild weather, which helps stabilize performance and improve dehumidification.
Warranty & Reliability
Comfort-Aire provides a 10-year warranty on both parts and the compressor upon timely registration. Because the brand does not currently offer a dedicated unit replacement guarantee for major component failures in this series, it receives a 3-star rating.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Comfort-Aire Model Comparison
Basic: ME Series
Why choose it: A reliable entry-point for homeowners seeking immediate Low-GWP compliance with a proven two-stage compressor system. Trade-offs: Lower EER than premium alternatives and lacks a unit replacement warranty.
Comfortmaker
★★★★☆
Comfortmaker has modernized its geothermal portfolio for 2026 by adopting R-454B Low-GWP refrigerant, led by the HCR Ion™ Series. We have selected this model because it combines high-performance variable-speed technology with a significantly lower environmental footprint than legacy R-410A systems, ensuring long-term compliance and sustainability.
Efficiency (EER/COP)
The HCR model achieves a 27.0 EER and a 4.6 COP in closed-loop configurations. According to our 2026 efficiency standards, this unit is firmly in the Premium category (20–29 EER), offering a high-efficiency alternative for homeowners seeking significant energy savings.
Compressor Technology
This system utilizes an advanced variable-speed compressor. By modulating its output to match the home's heating or cooling load precisely, this technology supports the 27.0 EER rating and provides superior humidity control and consistent temperatures compared to traditional single or two-stage units.
Warranty & Reliability
Comfortmaker earns a 4-Star rating due to its comprehensive 10-year parts and 10-year compressor warranties. Most notably, the HCR series includes a 10-year No Hassle Replacement™ limited warranty, which provides a full unit replacement if the compressor or major coil fails, offering industry-leading peace of mind.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Comfortmaker Model Comparison
Premium: HCR Ion™ (R-454B)
Why choose it: Delivers excellent efficiency (27.0 EER) and full 2026 Low-GWP compliance with the protection of a 10-year unit replacement guarantee. Trade-offs: While highly efficient, it does not reach the 30+ EER required for the Ultimate series designation.
Ultimate Series (30+ EER): HGY series (R-454B)
Why choose it: Designed for maximum efficiency, utilizing full inverter-driven technology to achieve EER ratings of 30 or higher. Trade-offs: Generally carries a higher initial installation cost compared to the HCR Premium series.
Day & Night
★★★★☆
Day & Night has streamlined its 2026 geothermal lineup around the HCR Ion™ Series, successfully transitioning to R-454B Low-GWP refrigerant. This model was selected for the JS and HTML update because it represents the brand's highest efficiency tier, utilizing variable-speed technology to meet modern environmental standards while maintaining the reliability the brand is known for.
Efficiency (EER/COP)
The HCR Ion™ series delivers a 27.0 EER and 4.6 COP in closed-loop applications. While high-performing, this rating places the unit in the Premium category (20–29 EER). It provides a significant efficiency advantage over basic models without the extreme cost overhead of ultra-niche systems.
Compressor Technology
This unit utilizes an advanced variable-speed compressor. Unlike fixed-speed systems, this technology allows the unit to modulate its output to match the home's exact needs, which is the primary driver behind its 27.0 EER rating and superior humidity control during the summer months.
Warranty & Reliability
We have assigned a 4-Star rating based on Day & Night's competitive warranty package. It features a 10-year parts and 10-year compressor warranty. Most notably, it includes a 5-year No Hassle Replacement™ limited warranty, which provides a one-time unit replacement if the compressor or coil fails within the first five years.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Day & Night Model Comparison
Premium Series: HCR Ion™
Why choose it: Best-in-class comfort for the brand, featuring a variable-speed compressor and full 2026 Low-GWP compliance. Trade-offs: While highly efficient, it does not currently offer a configuration that exceeds the 30 EER threshold for the "Ultimate" category.
Enertech
★★★☆☆
Following the 2025 brand consolidation, the Enertech name now leads the legacy of Hydron Module. The 2026 update highlights the Revolution2 YT series, which spearheads the transition to Low-GWP R-454B refrigerant. These models were selected to ensure long-term environmental compliance while maintaining the high craftsmanship and efficiency standards established by the original Hydron facility.
Efficiency (EER/COP)
The Revolution2 YT achieves a closed-loop EER of up to 28.2 and a COP of 4.8. Under the category logic, this performance places the series in the Premium tier, offering superior energy savings compared to basic geothermal systems.
Compressor Technology
This series utilizes two-stage compressor technology. By operating at a lower capacity during mild weather and switching to full power only during peak demand, it optimizes energy consumption and provides enhanced humidity control for a more comfortable indoor environment.
Warranty & Reliability
Enertech offers a robust 10-year parts warranty and an industry-leading "Option 18" extended compressor and coil coverage. However, because the standard terms do not include a dedicated Unit Replacement "Lemon Law" provision, the brand carries a 3-star rating under the 2026 criteria.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Enertech Model Comparison
Premium: Revolution2 YT (R-454B)
Why choose it: Future-proofed with R-454B refrigerant and high Premium-tier efficiency ratings for residential applications. Trade-offs: Lacks a lifetime unit replacement guarantee found in some Ultimate-tier competitors.
Geocomfort
★★★★★
Geocomfort has fully optimized its 2026 product strategy around the transition to R-454B Low-GWP refrigerant, retiring legacy series like the Compass to focus on the advanced YT and ZT platforms. By centering their lineup on these A2L-compliant models, Geocomfort ensures homeowners receive the most environmentally responsible technology that meets all upcoming EPA mandates while delivering elite efficiency.
Efficiency (EER/COP)
The Geocomfort YT series is a market leader, achieving a Closed Loop EER of up to 31.3 and a COP of 5.1, placing it in the Ultimate category. Their ZT horizontal models provide high-performance alternatives that fall into the Premium category, ensuring that regardless of installation footprint, the system exceeds Energy Star efficiency requirements.
Compressor Technology
Both the YT and ZT series utilize high-efficiency two-stage compressors. This staging allows the units to run at lower capacities during moderate weather, which is the primary driver for achieving 30+ EER ratings and superior humidity control compared to single-stage systems.
Warranty & Reliability
Geocomfort earns a 5-Star rating due to their "Peace of Mind" warranty registration. While the standard 10-year parts and compressor warranty is competitive, their registered upgrade extends protection for the compressor and microchannel air coils to 18 years, providing long-term security that is nearly double the industry standard.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Geocomfort Model Comparison
Premium Series: ZT
Why choose it: A compact horizontal solution for tight spaces that maintains a high Premium-tier EER of 26.6 and full Low-GWP compliance. Trade-offs: Slightly lower efficiency than the vertical YT flagship model.
Ultimate Series (30+ EER): YT
Why choose it: The flagship vertical packaged unit boasting an Ultimate-tier 31.3 EER and the latest R-454B refrigerant technology. Trade-offs: The multi-position vertical cabinet requires more dedicated floor space than horizontal or split configurations.
Geocool
★★★☆☆
The 2026 GeoCool Inverter Series marks a significant milestone in MRCOOL’s geothermal lineup, completing the transition to Low-GWP R-454B refrigerant. We selected the Inverter Series for this review because it leverages variable-speed DC technology to provide high-efficiency performance while adhering to the latest environmental mandates, offering a DIY-friendly approach to advanced geothermal technology.
Efficiency (EER/COP)
With a Closed-Loop Part-Load EER of 48.8 and a COP of 5.1, the GeoCool Inverter Series easily qualifies for the Ultimate category. These ratings reflect the system's ability to modulate its output, ensuring it only uses the precise amount of energy needed to maintain indoor comfort.
Compressor Technology
At the heart of this system is a high-precision DC Inverter variable-speed compressor. Unlike traditional single or two-stage compressors that cycle on and off, this inverter technology allows the unit to scale its capacity from 20% to 100%, driving the exceptionally high EER ratings and providing ultra-quiet operation.
Warranty & Reliability
The system is backed by a solid 10-year parts and 10-year compressor warranty, along with a 5-year limited labor warranty. Because it lacks a specific unit replacement guarantee (No-Hassle/Lifetime), it earns a 3-Star rating. However, the inclusion of a co-axial copper-nickel heat exchanger significantly enhances reliability in varied water conditions.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Geocool Model Comparison
Premium Series: GeoCool GCHP (R-454B)
Why choose it: A balanced choice for those seeking Low-GWP compliance and reliable performance at a more accessible price point. Trade-offs: Fixed-speed operation results in lower overall EER compared to the Inverter models.
Ultimate Series (30+ EER): GeoCool Inverter (R-454B)
Why choose it: Features maximum efficiency through variable-speed DC Inverter technology and is the first DIY-compatible geothermal split system. Trade-offs: Higher initial equipment cost and more complex electronic controls than the standard GCHP series.
Geostar
★★★☆☆
Geostar has modernized its residential lineup by transitioning to R-454B Low-GWP refrigerants. For 2026, we have evaluated the Magnolia™ Plus, Aston®, and Sycamore® series to demonstrate how Geostar covers the spectrum from entry-level reliability to high-end performance while meeting new environmental standards.
Efficiency (EER/COP)
Geostar offers solutions across all three efficiency tiers. The Magnolia™ Plus serves the Basic category (18.5 EER), while the Aston® provides Premium performance (23.0 EER). For those seeking maximum energy savings, the Sycamore® series reaches the Ultimate category with an EER of 30.3.
Compressor Technology
The lineup features three distinct technologies: reliable single-stage compressors in the Magnolia™ Plus, dual-stage scroll compressors in the Aston® for improved part-load efficiency, and advanced variable-speed inverter technology in the Sycamore® to achieve its Ultimate-tier rating.
Warranty & Reliability
Geostar provides a consistent 10-year parts and 10-year compressor warranty across these residential models. Because the brand does not include a dedicated unit replacement guarantee for major component failures, it maintains a 3-Star rating, reflecting high build quality without the added protection of a replacement pledge.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Geostar Model Comparison
Basic: Magnolia™ Plus Series (R-454B)
Why choose it: A budget-friendly entry point for geothermal that meets 2026 Low-GWP regulations. Trade-offs: Single-stage operation provides lower EER and less precise comfort control.
Premium: Aston® Series with Low GWP
Why choose it: Proven two-stage reliability and enhanced efficiency for a balanced performance-to-cost ratio. Trade-offs: Does not reach the 30+ EER threshold of variable-speed systems.
Ultimate Series (30+ EER): Sycamore® Series with Low GWP
Why choose it: The flagship model offering an EER of 30.3 and superior comfort through variable-speed technology. Trade-offs: Significantly higher upfront equipment cost.
Heil
★★★★☆
Heil has successfully transitioned its premium geothermal lineup to the Low-GWP refrigerant R-454B, with the HCR Ion™ Series serving as the flagship for 2026. These models were selected for this update because they represent the brand's commitment to meeting new environmental mandates while delivering superior efficiency and the enhanced protection of the Ion™ technology suite.
Efficiency (EER/COP)
The HCR Ion™ Series delivers a high-performance 27.0 EER and a 4.6 COP in closed-loop applications. Under our 2026 enforcement logic, this performance profile places the unit firmly in the Premium category, providing significant energy savings over legacy R-410A systems.
Compressor Technology
This model features an advanced variable-speed compressor. By constantly modulating its output to match the precise thermal load of the home, the system avoids the energy spikes of frequent cycling, directly contributing to its high Premium-tier EER rating and superior humidity control.
Warranty & Reliability
Heil earns a 4-Star rating due to its robust 10-year parts and 10-year compressor warranties. The rating is further elevated by the inclusion of a 10-year No Hassle Replacement™ limited warranty, which ensures a complete unit replacement if the compressor or coil fails during the first decade of operation.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Heil Model Comparison
Premium: HCR
Why choose it: Exceptional 27.0 EER efficiency combined with full 2026 Low-GWP compliance and an industry-leading 10-year unit replacement guarantee. Trade-offs: While it represents the top of the Heil lineup, it does not reach the 30+ EER threshold required for the Ultimate category.
KeepRite
★★★★☆
KeepRite's 2026 update marks a major shift toward environmental sustainability with the introduction of the HCR Ion™ Series. These models utilize R-454B, a mildly flammable (A2L) refrigerant with a Global Warming Potential (GWP) of 466—a 75% reduction compared to legacy R-410A systems. We selected the HCR Ion™ for this update because it maintains high performance standards while complying with the latest EPA Low-GWP mandates.
Efficiency (EER/COP)
The HCR Ion™ Series delivers a Closed-Loop EER of up to 27.8 and a COP of 4.9. Under our 2026 category logic, these specs place the unit firmly in the Premium category (EER 20.0 – 29.9), offering significant utility savings over standard air-source equipment.
Compressor Technology
This series utilizes a Two-Stage Scroll Compressor. By operating at a lower capacity during milder weather and only ramping up to full speed when demand is high, the system reduces energy consumption and provides superior humidity control compared to single-stage units.
Warranty & Reliability
KeepRite earns a 4-Star rating due to its robust 10-Year No Hassle Replacement™ limited warranty. If the compressor or major coil fails within the first 10 years, KeepRite provides a one-time equivalent unit replacement, in addition to the standard 10-year parts warranty.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
KeepRite Model Comparison
Premium: HCR
Why choose it: Leading-edge R-454B compliance combined with a class-leading 10-year unit replacement warranty. Trade-offs: While highly efficient, it does not reach the 30+ EER "Ultimate" tier reserved for full variable-speed inverter models.
Nordic
★★★☆☆
Nordic has successfully modernized its flagship residential lineup by transitioning to R-454B low-GWP refrigerant. The updated R-Series represents their commitment to environmental compliance while maintaining the rugged, cold-climate performance they are known for in the North American market. We selected the R-Series for this update as it serves as the primary residential water-to-air solution, now optimized for the 2026 refrigerant standards.
Efficiency (EER/COP)
With a Closed-Loop EER reaching up to 24.5 and a COP of 4.9, the Nordic R-Series comfortably sits in the Premium category. These ratings ensure significant energy savings over legacy HVAC systems, particularly when paired with a properly sized ground loop.
Compressor Technology
The R-Series utilizes a high-efficiency two-stage scroll compressor. This technology allows the unit to operate at a lower capacity during mild weather for improved humidity control and energy savings, while still having the full-stage power necessary for extreme temperature demands.
Warranty & Reliability
Nordic offers a solid 10-year limited warranty on major refrigerant circuit components and 5 years on other parts. However, because the warranty lacks a dedicated Unit Replacement clause for major failures, the system receives a 3-Star rating under our strict 2026 reliability criteria.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Nordic Model Comparison
Premium: R-Series (R-454B)
Why choose it: Outstanding build quality and full compliance with Low-GWP regulations without sacrificing the 4.9 COP efficiency. Trade-offs: Lacks the variable-speed compressor technology found in some "Ultimate" tier competitors and does not include a lifetime warranty or unit replacement guarantee.
Northern Heat Pump
★★★☆☆
Northern Heat Pump has transitioned its rugged North Star lineup to R-454B refrigerant for 2026. Known for their "over-built" philosophy, these units were selected for this update because they combine industrial-grade stainless steel construction with the latest Low-GWP compliance, ensuring they remain a top choice for harsh northern climates where durability is paramount.
Efficiency (EER/COP)
The lineup spans from the 17.5 EER Basic tier to the 23.0 EER Premium tier. These ratings represent steady-state efficiency in closed-loop applications, providing a balance of high thermal performance and reliable operation across a wide range of ground temperatures.
Compressor Technology
The Premium models utilize two-stage scroll compressors, allowing the system to run at 67% capacity for maximum efficiency and humidity control during most of the year, while the Basic models use a reliable single-stage scroll for simpler, cost-effective operation.
Warranty & Reliability
Northern Heat Pump earns a 3-star rating with a solid 10-year parts and compressor warranty. While they lack a lifetime unit replacement guarantee found in 5-star brands, their 304-grade stainless steel cabinets offer a "Lifetime" durability against corrosion that is unmatched in the industry.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Northern Heat Pump Model Comparison
Premium: North Star Series (R-454B)
Why choose it: The two-stage compressor offers superior comfort and a higher 23.0 EER, making it the most efficient choice for homeowners looking to maximize energy savings with Low-GWP tech. Trade-offs: Higher upfront investment compared to single-stage units.
Basic: North Star Single-Stage (R-454B)
Why choose it: Provides the same legendary stainless steel durability and R-454B compliance at a lower price point, ideal for simple installations. Trade-offs: Lower 17.5 EER efficiency and single-speed operation may lead to more temperature fluctuations.
Tempstar
★★★★☆
Tempstar, a member of the International Comfort Products (ICP) family under Carrier Global, has successfully transitioned its 2026 geothermal lineup to R-454B Low-GWP refrigerant. The HCR Ion™ Series was selected for this update as it represents the brand's flagship commitment to environmental sustainability and high-efficiency performance, effectively replacing legacy R-410A models while maintaining a robust USA-based manufacturing heritage.
Efficiency (EER/COP)
The HCR Ion™ Series delivers a Closed-Loop EER of 27.0 and a COP of 4.6. Following our 2026 efficiency logic, this model is classified as a Premium geothermal system, providing a high-performance balance for homeowners looking to maximize energy savings within the 20.0–29.9 EER range.
Compressor Technology
This model features advanced variable-speed compressor technology. Unlike traditional systems that cycle on and off, the variable-speed logic allows the unit to modulate its capacity to the exact needs of the home, which directly supports its high EER rating and ensures consistent indoor climate stability.
Warranty & Reliability
Tempstar is awarded a 4-Star rating thanks to its 10-year parts and 10-year compressor limited warranties. Crucial to this rating is the 10-year No Hassle Replacement™ limited warranty, which provides a complete new unit if the compressor or coil fails during the first decade of operation.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Tempstar Model Comparison
Premium: HCR Ion™ Series (R-454B)
Why choose it: Offers full 2026 Low-GWP compliance with a 27.0 EER and one of the best unit replacement warranties in the industry. Trade-offs: While highly efficient, it does not reach the 30.0 EER threshold required for the Ultimate category.
Waterfurnace
★★★☆☆
WaterFurnace has fully refreshed its lineup for 2026, transitioning its core residential platforms to R-454B Low-GWP refrigerant. We have selected the 7 Series, 5 Series, and Aura models to represent the Ultimate, Premium, and Basic categories respectively, ensuring a high-efficiency solution is available regardless of the application's complexity or budget.
Efficiency (EER/COP)
WaterFurnace maintains a wide efficiency spectrum. The 7 Series leads the 'Ultimate' tier with a 41.0 EER, while the 5 Series handles the 'Premium' tier at 28.0 EER. The newly updated Aura series serves the 'Basic' tier, staying just under the 20.0 EER threshold while still providing significant energy savings over air-source equipment.
Compressor Technology
The brand utilizes a tiered technology approach: variable-speed modulation in the 7 Series for maximum precision, two-stage operation in the 5 Series for balanced comfort, and reliable single-stage scrolls in the Basic Aura series to keep installation costs manageable.
Warranty & Reliability
This brand earns a 3-Star rating. While they offer a solid 10-year parts and 10-year compressor warranty across their primary lines, they do not currently offer a standard factory-backed unit replacement "no-hassle" guarantee, which prevents a move into the 4 or 5-star Green tier.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment.
Waterfurnace Model Comparison
Ultimate: 7 Series 700A11 (R-454B)
Why choose it: Industry-leading 41.0 EER and full variable-speed modulation for the ultimate in humidity control and Low-GWP efficiency. Trade-offs: Premium pricing and requires proprietary communicating thermostats.
Premium: 5 Series 500A11 (R-454B)
Why choose it: The perfect middle ground using two-stage compression and R-454B to hit high efficiency targets reliably. Trade-offs: Does not reach the ultra-high EER levels of the variable-speed 7 Series.
Basic: Aura Series (R-454B)
Why choose it: A durable, entry-level geothermal solution that meets 2026 refrigerant standards without the cost of multi-stage compressors. Trade-offs: Single-stage operation offers less precise temperature and humidity management.
York
★★★☆☆
York has modernized its 2026 geothermal lineup by fully adopting R-454B, a Low-GWP refrigerant that significantly reduces environmental impact compared to legacy R-410A systems. This update focuses on the Affinity™ Y5A and LX™ Y3A models, which were selected for their ability to meet the new regulatory standards while maintaining the high efficiency and reliability York is known for in the residential market.
Efficiency (EER/COP)
York’s geothermal offerings cover a wide performance spectrum. The Affinity™ Y5A reaches the "Ultimate" category with an impressive 30.0 EER and 5.0 COP. The LX™ Y3A serves as the "Premium" option, delivering a closed-loop EER of 22.4 and a 4.3 COP, providing a cost-effective balance of performance and long-term utility savings.
Compressor Technology
Both selected series utilize Dual Capacity (Two-stage) compressor technology. This allows the units to operate at a lower, energy-saving speed during mild weather and ramp up to full capacity only when demand is high. This two-stage approach enhances humidity control and reduces mechanical wear compared to single-stage systems.
Warranty & Reliability
York provides a solid 10-year parts and 10-year compressor warranty upon timely online registration. However, because York does not currently offer a "Unit Replacement" or "No-Hassle" pledge specifically for their geothermal packaged chassis, the brand receives a 3-Star (Yellow) rating, reflecting strong component coverage without the elite replacement guarantees found in some competitor tiers.
Indoor Construction
Built for indoor longevity, these units feature heavy-gauge steel cabinets and advanced sound insulation to ensure quiet operation within the home environment. The cabinets are finished with a professional-grade powder coat and lined with foil-backed insulation to protect against moisture and minimize vibration.
York Model Comparison
Ultimate: Affinity™ Y5A (R-454B)
Why choose it: Industry-leading 30 EER performance and dual-stage comfort using the latest eco-friendly refrigerants. Trade-offs: Higher initial cost compared to the LX series.
Premium: LX™ Y3A Series (R-454B)
Why choose it: High-efficiency dual-stage performance at a more accessible price point for homeowners transitioning to geothermal. Trade-offs: Lower EER rating than the top-tier Affinity models.
