Against comparable models

Each cell is the share of same-size, same-type models that the manufacturer’s typical model beats (50% is typical); the higher score is in bold. Raw medians are underneath for context: they depend on which sizes each one makes, so they are not compared.

AireForce and KERR on every ratingPeer scores, 0–100 · grey ticks: every ranked manufacturer · shaded: the middle half of each one’s modelsMeasured against models of the same size and duct type, KERR scores higher on 6 of the 6 ratings.

AireForce
KERR
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 9, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	AireForce	KERR
Efficiency index	45%median —	66%median —
COP at 5°F	32%median 1.81	49%median 1.95
Capacity retention at 5°F	65%median 77%	78%median 91%
HSPF2	37%median 8.5	76%median 10.0
SEER2	40%median 17.5	68%median 20.0
EER2	43%median 11.0	58%median 11.9
Heating capacity at 5°F	63%median 19,800 Btu/h	75%median 25,000 Btu/h
Outdoor models	23	24
AHRI certifications	54	90

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	AireForce	KERR
CEE 2025 Tier 1 (Split ASHP)	52.2%12 models	83.3%20 models
CEE 2026 Tier 1 (Split ASHP)	52.2%12 models	83.3%20 models
CEE Advanced Tier (Split ASHP)	0%0 models	8.3%2 models
Xcel Energy Colorado cold-climate ASHP (2025)	56.5%13 models	79.2%19 models
DOE Cold Climate Heat Pump Challenge	0%0 models	8.3%2 models
ENERGY STAR Cold Climate	34.8%8 models	87.5%21 models

Sizes and duct types offered

Models in each peer group, with the efficiency index of those models against the rest of the group.

Side by side, inside each size and duct typeShape: every model of the group · bars: each manufacturer’s middle half, median dot, 10th–90th line · 7 groups where both have models

AireForce
KERR
All models of the group

Raw ratings are only placed side by side within one size and duct type, where they are comparable.

Source: AHRI Directory · as of Oct 9, 2026

Models per peer group · efficiency index within the group
Size and duct type	AireForce	KERR
Ducted, up to 1.5 tons	3 · index 31%	6 · index 60%
Ducted, 2 tons	3 · index 53%	3 · index 71%
Ducted, 2.5–3 tons	4 · index 52%	5 · index 67%
Ducted, 3.5–4.5 tons	3 · index 63%	4 · index 63%
Non-ducted, up to 1.5 tons	8 · index 28%	7 · index 68%
Non-ducted, 2 tons	2 · index 57%	3 · index 79%
Non-ducted, 2.5–3 tons	5 · index 60%	6 · index 64%
Non-ducted, 3.5–4.5 tons	None	2 · index 65%

Cold-climate and all-around picks, size class by size class

Each manufacturer’s best model on each board in every size and duct type, side by side; the higher score is in bold. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there), so the two compare fairly even when they make different sizes.

Cold-climate picks

Best cold-climate pick per size and duct type (keeps at least 70% of its heat at 5°F). Qualifies when its capacity retention at 5°F (capacity at 5°F as a share of capacity at 47°F) is at least 70% and Capacity retention at 5°F, COP at 5°F, HSPF2 are all rated. Score = the equal-weight mean of its peer percentiles on Capacity retention at 5°F, COP at 5°F, HSPF2 (share of the other models in its peer group it beats, 0–100), all from one certified pairing: in each duct type a model is sold in, its qualifying pairing of that type with the best score; equal scores (one decimal) go to the higher heating capacity at 5°F.
Size and duct type	AireForceCold-climate score, best model	KERRCold-climate score, best model
Ducted, up to 1.5 tons	35.6(50 is the typical model of its size class)GXH18(5.3)FMK4DH-11 of 3 models qualify · AHRI 211635197	74.9(50 is the typical model of its size class) (higher)A-KMH09SV-1with ducted air handler B-KMH09DU-16 of 6 models qualify · AHRI 210568255
Ducted, 2 tons	50.1(50 is the typical model of its size class)GXH24(7.0)FMK4DH-11 of 2 models qualify · AHRI 211635198	79.4(50 is the typical model of its size class) (higher)A-KMH24SU-1Awith ducted air handler B-KMH24DU-1Also listed as A-KMH24SV-13 of 3 models qualify · AHRI 206347321
Ducted, 2.5–3 tons	55.3(50 is the typical model of its size class)GXH24-36MSK4DHwith ducted air handler GMH**-36MSK4DH14 of 5 models qualify · AHRI 206724405	79.9(50 is the typical model of its size class) (higher)A-KMH36QV-1A5 of 5 models qualify · AHRI 217169741
Ducted, 3.5–4.5 tons	58.1(50 is the typical model of its size class)GXH48-60MSK4DHwith ducted air handler GMH48-**MSK4DH11 of 3 models qualify · AHRI 206724406	74.9(50 is the typical model of its size class) (higher)A-KMH48PV-14 of 4 models qualify · AHRI 207657607
Non-ducted, up to 1.5 tons	73.1(50 is the typical model of its size class)GXH18(5.3)FMK4DH-17 of 8 models qualify · AHRI 211635192	89.3(50 is the typical model of its size class) (higher)A-KMH06SV-1with ductless indoor unit B-KMH06SV-17 of 7 models qualify · AHRI 207657393
Non-ducted, 2 tons	76.1(50 is the typical model of its size class)GXH24(7.0)FMK4DH-12 of 2 models qualify · AHRI 211635193	86.1(50 is the typical model of its size class) (higher)A-KMH24SV-1with ductless indoor unit C-VMH24CV-13 of 3 models qualify · AHRI 207657400
Non-ducted, 2.5–3 tons	73.7(50 is the typical model of its size class)GXH42(12.3)FMK4DH-15 of 5 models qualify · AHRI 211635196	90.9(50 is the typical model of its size class) (higher)A-KMH36QV-1A3 of 6 models qualify · AHRI 217169740
Non-ducted, 3.5–4.5 tons	No models in this size class	76.2(50 is the typical model of its size class)A-KMH48PV-12 of 2 models qualify · AHRI 207657606

All-around best

Best all-around model per size and duct type. Score = 50% heating, the mean of its peer percentiles on COP at 5°F, Capacity retention at 5°F, HSPF2, plus 50% cooling, the mean of its peer percentiles on SEER2 and EER2 (share of the other models in its peer group it beats, 0–100). All five ratings are required; there is no minimum heat kept at 5°F. In each duct type a model is sold in, it is scored on its pairing of that type with the best score; equal scores (one decimal) go to the higher cold-climate score, then the higher heating capacity at 5°F.
Size and duct type	AireForceAll-around score, best model	KERRAll-around score, best model
Ducted, up to 1.5 tons	31.2(50 is the typical model of its size class)GXH18(5.3)FMK4DH-11 of 3 models have all five ratings · AHRI 211635197	85.2(50 is the typical model of its size class) (higher)A-KMH09SV-1with ducted air handler B-KMH09DU-16 of 6 models have all five ratings · AHRI 210568255
Ducted, 2 tons	60.8(50 is the typical model of its size class)GXH24-36MSK4DHwith ducted air handler GMH24-**MSK4DH12 of 3 models have all five ratings · AHRI 206724404	80.1(50 is the typical model of its size class) (higher)A-KMH24SU-1Awith ducted air handler B-KMH24DU-1Also listed as A-KMH24SV-13 of 3 models have all five ratings · AHRI 206347321
Ducted, 2.5–3 tons	53.1(50 is the typical model of its size class)GXH30(8.8)FMK4DH-13 of 4 models have all five ratings · AHRI 211635199	83.7(50 is the typical model of its size class) (higher)A-KMH36QV-1A5 of 5 models have all five ratings · AHRI 217169741
Ducted, 3.5–4.5 tons	63.3(50 is the typical model of its size class)GXH48-60MSK4DHwith ducted air handler GMH48-**MSK4DH11 of 3 models have all five ratings · AHRI 206724406	82.0(50 is the typical model of its size class) (higher)A-KMH48PV-14 of 4 models have all five ratings · AHRI 207657607
Non-ducted, up to 1.5 tons	58.0(50 is the typical model of its size class)GXH18(5.3)FMK4DH-18 of 8 models have all five ratings · AHRI 211635192	92.0(50 is the typical model of its size class) (higher)A-KMH06SV-1with ductless indoor unit B-KMH06SV-17 of 7 models have all five ratings · AHRI 207657393
Non-ducted, 2 tons	71.5(50 is the typical model of its size class)GXH24(7.0)FMK4DH-12 of 2 models have all five ratings · AHRI 211635193	84.3(50 is the typical model of its size class) (higher)A-KMH24SV-1with ductless indoor unit B-KMH24SV-1Also listed as A-KMH24SU-13 of 3 models have all five ratings · AHRI 207657397
Non-ducted, 2.5–3 tons	70.2(50 is the typical model of its size class)GXH42(12.3)FMK4DH-15 of 5 models have all five ratings · AHRI 211635196	86.4(50 is the typical model of its size class) (higher)A-KMH36QV-1A5 of 6 models have all five ratings · AHRI 217169740
Non-ducted, 3.5–4.5 tons	No models in this size class	77.9(50 is the typical model of its size class)A-KMH48PV-12 of 2 models have all five ratings · AHRI 207657606

All-around board, every manufacturer

Standout model on each rating

Each manufacturer’s model that beats the largest share of comparable models on the rating; the higher share is in bold.

Top model per rating by peer percentile, with its AHRI-certified value and peer group
Rating	AireForce	KERR
COP at 5°F	beats 89% · 2.21GXH18(5.3)FMK4DH-1Non-ducted, up to 1.5 tons	beats 91% · 2.21A-KMH24SV-1Also listed as A-KMH24SU-1Non-ducted, 2 tons
Capacity retention at 5°F	beats 85% · 89%GXH30(8.8)FMK4DH-1Ducted, 2.5–3 tons	beats 98% · 112%A-KCD36SA-1Ducted, 2.5–3 tons
HSPF2	beats 82% · 10.0GXH30(8.8)FMK4DH-1Non-ducted, 2.5–3 tons	beats 98% · 13.6A-KMH06SV-1Non-ducted, up to 1.5 tons
SEER2	beats 83% · 24.0GXH12(3.5)LSK4DH2Non-ducted, up to 1.5 tons	beats 99% · 20.9A-KMH48PV-1Ducted, 3.5–4.5 tons
EER2	beats 84% · 12.5GXH30(8.8)FMK4DH-1Non-ducted, 2.5–3 tons	beats 98% · 16.2A-KMH09SV-1Non-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 86% · 14,500 Btu/hGXH18(5.3)LSK4DH2Non-ducted, up to 1.5 tons	beats 99% · 42,000 Btu/hA-KCD36SA-1Ducted, 2.5–3 tons

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AireForce vs KERR heat pumps