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.

CanAir and STEALTH 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, CanAir scores higher on 6 of the 6 ratings.

CanAir
STEALTH
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	CanAir	STEALTH
Efficiency index	64% (higher)median —	54% (higher)median —
COP at 5°F	65% (higher)median 2.07	53% (higher)median 2.00
Capacity retention at 5°F	61% (higher)median 82%	59% (higher)median 78%
HSPF2	74% (higher)median 10.0	59% (higher)median 9.0
SEER2	66% (higher)median 21.1	62% (higher)median 18.0
EER2	60% (higher)median 12.0	39% (higher)median 11.3
Heating capacity at 5°F	63% (higher)median 20,000 Btu/h	62% (higher)median 24,600 Btu/h
Outdoor models	44	11
AHRI certifications	157	11

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	CanAir	STEALTH
CEE 2025 Tier 1 (Split ASHP)	93.2%41 models	72.7%8 models
CEE 2026 Tier 1 (Split ASHP)	93.2%41 models	72.7%8 models
CEE Advanced Tier (Split ASHP)	2.3%1 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	90.9%40 models	63.6%7 models
DOE Cold Climate Heat Pump Challenge	2.3%1 models	0%0 models
ENERGY STAR Cold Climate	90.9%40 models	0%0 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

CanAir
STEALTH
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	CanAir	STEALTH
Ducted, up to 1.5 tons	9 · index 76%	1 · index 47%
Ducted, 2 tons	4 · index 71%	1 · index 37%
Ducted, 2.5–3 tons	9 · index 65%	2 · index 42%
Ducted, 3.5–4.5 tons	8 · index 66%	2 · index 51%
Ducted, 5 tons and up	1 · index 65%	None
Non-ducted, up to 1.5 tons	19 · index 67%	1 · index 60%
Non-ducted, 2 tons	3 · index 65%	1 · index 72%
Non-ducted, 2.5–3 tons	9 · index 55%	3 · index 62%
Non-ducted, 3.5–4.5 tons	7 · index 47%	None

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	CanAirCold-climate score, best model	STEALTHCold-climate score, best model
Ducted, up to 1.5 tons	82.3(50 is the typical model of its size class) (higher)4C28SCH18H21with ducted air handler 4C28SEDH18H219 of 9 models qualify · AHRI 217958974	49.3(50 is the typical model of its size class)AC-18-HP-E-32with ducted air handler AC-18-AH-E-321 of 1 models qualify · AHRI 218729456
Ducted, 2 tons	85.7(50 is the typical model of its size class) (higher)4C28SCH24H21with ducted air handler 4C28SEDH24H214 of 4 models qualify · AHRI 217958975	45.9(50 is the typical model of its size class)AC-24-HP-E-32with ducted air handler AC-24-AH-E-321 of 1 models qualify · AHRI 218729457
Ducted, 2.5–3 tons	83.2(50 is the typical model of its size class)4C28LCH36H21with ducted air handler 4C28LEDH36H216 of 9 models qualify · AHRI 217958976	None on this board (0 of 2 models qualify)
Ducted, 3.5–4.5 tons	82.7(50 is the typical model of its size class) (higher)4C28MC648H218 of 8 models qualify · AHRI 215449734	72.2(50 is the typical model of its size class)AC-48-HP-E-32with ducted air handler AC-48-AH-E-322 of 2 models qualify · AHRI 218729460
Ducted, 5 tons and up	None on this board (0 of 1 models qualify)	No models in this size class
Non-ducted, up to 1.5 tons	96.7(50 is the typical model of its size class) (higher)4C28SCH06H21with ductless indoor unit 4C28SEH06H2117 of 19 models qualify · AHRI 215449716	64.5(50 is the typical model of its size class)AC-18Z-E-M21 of 1 models qualify · AHRI 218729439
Non-ducted, 2 tons	89.4(50 is the typical model of its size class) (higher)4C28SCH24H21with ductless indoor unit 4C28SEQ24H213 of 3 models qualify · AHRI 217958956	67.5(50 is the typical model of its size class)AC-24Z-E-M31 of 1 models qualify · AHRI 218729440
Non-ducted, 2.5–3 tons	89.4(50 is the typical model of its size class) (higher)4C28LCH36H21with ductless indoor unit 4C28LEP36H217 of 9 models qualify · AHRI 217958937	58.8(50 is the typical model of its size class)AC-42Z-E-M53 of 3 models qualify · AHRI 218729443
Non-ducted, 3.5–4.5 tons	73.4(50 is the typical model of its size class)4C28MC648H216 of 7 models qualify · AHRI 215449735	No models in this size class

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	CanAirAll-around score, best model	STEALTHAll-around score, best model
Ducted, up to 1.5 tons	86.7(50 is the typical model of its size class) (higher)4C28SCH09H21with ducted air handler 4C28SEDL09H219 of 9 models have all five ratings · AHRI 217958962	47.1(50 is the typical model of its size class)AC-18-HP-E-32with ducted air handler AC-18-AH-E-321 of 1 models have all five ratings · AHRI 218729456
Ducted, 2 tons	78.8(50 is the typical model of its size class) (higher)4C25SCH24H21with ducted air handler 4C28SEDH24H214 of 4 models have all five ratings · AHRI 217958968	37.2(50 is the typical model of its size class)AC-24-HP-E-32with ducted air handler AC-24-AH-E-321 of 1 models have all five ratings · AHRI 218729457
Ducted, 2.5–3 tons	83.6(50 is the typical model of its size class) (higher)4C28MC536H219 of 9 models have all five ratings · AHRI 215449731	42.6(50 is the typical model of its size class)AC-36-HP-E-32with ducted air handler AC-36-AH-E-322 of 2 models have all five ratings · AHRI 218729459
Ducted, 3.5–4.5 tons	85.1(50 is the typical model of its size class) (higher)4C25MC548H218 of 8 models have all five ratings · AHRI 217958993	53.2(50 is the typical model of its size class)AC-48-HP-E-32with ducted air handler AC-48-AH-E-322 of 2 models have all five ratings · AHRI 218729460
Ducted, 5 tons and up	65.3(50 is the typical model of its size class)4C25LCH60H21with ducted air handler 4C28LEDH60H211 of 1 models have all five ratings · AHRI 217958971	No models in this size class
Non-ducted, up to 1.5 tons	96.2(50 is the typical model of its size class) (higher)4C28SCH06H21with ductless indoor unit 4C28SEH06H2118 of 19 models have all five ratings · AHRI 215449716	59.7(50 is the typical model of its size class)AC-18Z-E-M21 of 1 models have all five ratings · AHRI 218729439
Non-ducted, 2 tons	86.8(50 is the typical model of its size class) (higher)4C25SCH24H21with ductless indoor unit 4C28SEH24H213 of 3 models have all five ratings · AHRI 215828390	71.8(50 is the typical model of its size class)AC-24Z-E-M31 of 1 models have all five ratings · AHRI 218729440
Non-ducted, 2.5–3 tons	78.3(50 is the typical model of its size class) (higher)4C28MC536H219 of 9 models have all five ratings · AHRI 215449730	66.6(50 is the typical model of its size class)AC-30Z-E-M43 of 3 models have all five ratings · AHRI 218729441
Non-ducted, 3.5–4.5 tons	75.6(50 is the typical model of its size class)4C28MC648H217 of 7 models have all five ratings · AHRI 215449733	No models in this size class

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	CanAir	STEALTH
COP at 5°F	beats 99% · 2.514C25SCH12H21Non-ducted, up to 1.5 tons	beats 69% · 2.10AC-48-HP-E-32Ducted, 3.5–4.5 tons
Capacity retention at 5°F	beats 98% · 120%4C28SCH09H21Ducted, up to 1.5 tons	beats 79% · 90%AC-24Z-E-M3Non-ducted, 2 tons
HSPF2	beats 99% · 14.84C28SCH06H21Non-ducted, up to 1.5 tons	beats 69% · 9.0AC-48-HP-E-32Ducted, 3.5–4.5 tons
SEER2	beats 99% · 33.34C35SCH09H21Non-ducted, up to 1.5 tons	beats 79% · 23.0AC-24Z-E-M3Non-ducted, 2 tons
EER2	beats 99% · 18.04C28SCH06H21Non-ducted, up to 1.5 tons	beats 75% · 12.5AC-30Z-E-M4Non-ducted, 2.5–3 tons
Heating capacity at 5°F	beats 99% · 22,600 Btu/h4C35SCH18H21Non-ducted, up to 1.5 tons	beats 85% · 14,500 Btu/hAC-18Z-E-M2Non-ducted, up to 1.5 tons

More comparisons

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CanAir vs STEALTH heat pumps