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.

Everwell and HAXXAIR 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, HAXXAIR scores higher on 6 of the 6 ratings.

Everwell
HAXXAIR
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 11, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Everwell	HAXXAIR
Efficiency index	27%median —	71%median —
COP at 5°F	37%median 1.93	55%median 2.09
Capacity retention at 5°F	20%median 54%	78%median 97%
HSPF2	28%median 8.0	69%median 10.0
SEER2	26%median 15.7	78%median 22.0
EER2	30%median 10.9	73%median 12.9
Heating capacity at 5°F	28%median 11,050 Btu/h	70%median 19,800 Btu/h
Outdoor models	14	15
AHRI certifications	33	23

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Everwell	HAXXAIR
CEE 2025 Tier 1 (Split ASHP)	14.3%2 models	100%15 models
CEE 2026 Tier 1 (Split ASHP)	14.3%2 models	100%15 models
CEE Advanced Tier (Split ASHP)	0%0 models	13.3%2 models
Xcel Energy Colorado cold-climate ASHP (2025)	14.3%2 models	100%15 models
DOE Cold Climate Heat Pump Challenge	0%0 models	13.3%2 models
ENERGY STAR Cold Climate	0%0 models	100%15 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

Everwell
HAXXAIR
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 11, 2026

Models per peer group · efficiency index within the group
Size and duct type	Everwell	HAXXAIR
Ducted, up to 1.5 tons	1 · index 22%	1 · index 65%
Ducted, 2 tons	1 · index 25%	1 · index 80%
Ducted, 2.5–3 tons	4 · index 43%	3 · index 71%
Ducted, 3.5–4.5 tons	3 · index —	2 · index 71%
Ducted, 5 tons and up	None	1 · index 81%
Non-ducted, up to 1.5 tons	3 · index 13%	7 · index 79%
Non-ducted, 2 tons	1 · index —	1 · index 58%
Non-ducted, 2.5–3 tons	1 · index 8%	2 · index 63%
Non-ducted, 3.5–4.5 tons	None	1 · index 44%

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	EverwellCold-climate score, best model	HAXXAIRCold-climate score, best model
Ducted, up to 1.5 tons	None on this board (0 of 1 models qualify)	66.2(50 is the typical model of its size class)HVHMZ-18V2D1 of 1 models qualify · AHRI 216707866
Ducted, 2 tons	None on this board (0 of 1 models qualify)	82.1(50 is the typical model of its size class)HVHDZ-24V2Dwith ducted air handler HAHDZ-24V2D1 of 1 models qualify · AHRI 216014850
Ducted, 2.5–3 tons	57.0(50 is the typical model of its size class)EPKH03625HA-18Also listed as EPKH03625HA-182 of 4 models qualify · AHRI 217508977	87.9(50 is the typical model of its size class) (higher)HVHDZ-36V2Dwith ducted air handler HAHDZ-36V2D3 of 3 models qualify · AHRI 216014851
Ducted, 3.5–4.5 tons	None on this board (0 of 3 models qualify)	77.3(50 is the typical model of its size class)HVHDZ-48V2Dwith ducted air handler HAHDZ-48V2D2 of 2 models qualify · AHRI 216014852
Ducted, 5 tons and up	No models in this size class	88.7(50 is the typical model of its size class)HVHDZ-60V2Dwith ducted air handler HAHDZ-60V2D1 of 1 models qualify · AHRI 216014853
Non-ducted, up to 1.5 tons	None on this board (0 of 3 models qualify)	89.7(50 is the typical model of its size class)HVHZ-09A2Uwith ductless indoor unit HAHZ-09A2U7 of 7 models qualify · AHRI 217731091
Non-ducted, 2 tons	None on this board (0 of 1 models qualify)	48.1(50 is the typical model of its size class)HVHZ-24V2Dwith ductless indoor unit HAHZ-24V2D1 of 1 models qualify · AHRI 215887342
Non-ducted, 2.5–3 tons	None on this board (0 of 1 models qualify)	53.7(50 is the typical model of its size class)HVHMZ-36V2D2 of 2 models qualify · AHRI 216707875
Non-ducted, 3.5–4.5 tons	No models in this size class	16.4(50 is the typical model of its size class)HVHMZ-42V2D1 of 1 models qualify · AHRI 216707872

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	EverwellAll-around score, best model	HAXXAIRAll-around score, best model
Ducted, up to 1.5 tons	22.4(50 is the typical model of its size class)CAC1814HA15with ducted air handler A(E,F)W18J+TDR1 of 1 models have all five ratings · AHRI 218806265	64.6(50 is the typical model of its size class) (higher)HVHMZ-18V2D1 of 1 models have all five ratings · AHRI 216707866
Ducted, 2 tons	25.1(50 is the typical model of its size class)CAC2414HA15with ducted air handler L(E,F)W30CJ1 of 1 models have all five ratings · AHRI 218806266	79.5(50 is the typical model of its size class) (higher)HVHDZ-24V2Dwith ducted air handler HAHDZ-24V2D1 of 1 models have all five ratings · AHRI 216014850
Ducted, 2.5–3 tons	53.0(50 is the typical model of its size class)EPKH03625HA-18Also listed as EPKH03625HA-184 of 4 models have all five ratings · AHRI 217508977	82.3(50 is the typical model of its size class) (higher)HVHDZ-36V2Dwith ducted air handler HAHDZ-36V2D3 of 3 models have all five ratings · AHRI 216014851
Ducted, 3.5–4.5 tons	None on this board (0 of 3 models have all five ratings)	82.3(50 is the typical model of its size class)HVHDZ-48V2Dwith ducted air handler HAHDZ-48V2D2 of 2 models have all five ratings · AHRI 216014852
Ducted, 5 tons and up	No models in this size class	81.1(50 is the typical model of its size class)HVHDZ-60V2Dwith ducted air handler HAHDZ-60V2D1 of 1 models have all five ratings · AHRI 216014853
Non-ducted, up to 1.5 tons	22.1(50 is the typical model of its size class)MKTH1215C-17with ductless indoor unit MKTH1215E-173 of 3 models have all five ratings · AHRI 217500261	94.5(50 is the typical model of its size class) (higher)HVHZ-09A2Uwith ductless indoor unit HAHZ-09A2U7 of 7 models have all five ratings · AHRI 217731091
Non-ducted, 2 tons	None on this board (0 of 1 models have all five ratings)	58.3(50 is the typical model of its size class)HVHZ-24V2Dwith ductless indoor unit HAHZ-24V2D1 of 1 models have all five ratings · AHRI 215887342
Non-ducted, 2.5–3 tons	7.6(50 is the typical model of its size class)MKTH3625C-17*with ductless indoor unit MKTH3625E-171 of 1 models have all five ratings · AHRI 217730057	64.2(50 is the typical model of its size class) (higher)HVHMZ-27V2D2 of 2 models have all five ratings · AHRI 216707868
Non-ducted, 3.5–4.5 tons	No models in this size class	43.7(50 is the typical model of its size class)HVHMZ-42V2D1 of 1 models have all five ratings · AHRI 216707872

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	Everwell	HAXXAIR
COP at 5°F	beats 56% · 2.00EPKH03625HA-18Also listed as EPKH03625HA-18Ducted, 2.5–3 tons	beats 98% · 2.42HVHDZ-60V2DDucted, 5 tons and up
Capacity retention at 5°F	beats 56% · 73%EPKH03625HA-18Also listed as EPKH03625HA-18Ducted, 2.5–3 tons	beats 94% · 75%HVHDZ-60V2DDucted, 5 tons and up
HSPF2	beats 53% · 8.5EPKH03625HA-18Also listed as EPKH03625HA-18Ducted, 2.5–3 tons	beats 96% · 10.5HVHDZ-36V2DDucted, 2.5–3 tons
SEER2	beats 74% · 18.5EPKH03625HA-18Also listed as EPKH03625HA-18Ducted, 2.5–3 tons	beats 99% · 32.0HVHZ-09A2UNon-ducted, up to 1.5 tons
EER2	beats 54% · 11.4CAC4214HA15Ducted, 3.5–4.5 tons	beats 100% · 18.4HVHZ-09A2UNon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 63% · 26,400 Btu/hEPKH03625HA-18Also listed as EPKH03625HA-18Ducted, 2.5–3 tons	beats 93% · 18,000 Btu/hHVHZ-18V2DNon-ducted, up to 1.5 tons

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Everwell vs HAXXAIR heat pumps