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.

ECO AC and PERFECTAIRE 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, PERFECTAIRE scores higher on 4 of the 6 ratings.

ECO AC
PERFECTAIRE
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	ECO AC	PERFECTAIRE
Efficiency index	59%median —	62%median —
COP at 5°F	44%median 1.95	55%median 2.00
Capacity retention at 5°F	68%median 90%	71%median 94%
HSPF2	47%median 10.0	71%median 10.1
SEER2	64% (higher)median 21.0	57% (higher)median 20.0
EER2	68% (higher)median 12.3	61% (higher)median 12.0
Heating capacity at 5°F	63%median 18,000 Btu/h	70%median 18,000 Btu/h
Outdoor models	22	22
AHRI certifications	34	42

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	ECO AC	PERFECTAIRE
CEE 2025 Tier 1 (Split ASHP)	95.5%21 models	81.8%18 models
CEE 2026 Tier 1 (Split ASHP)	95.5%21 models	77.3%17 models
CEE Advanced Tier (Split ASHP)	13.6%3 models	4.5%1 models
Xcel Energy Colorado cold-climate ASHP (2025)	95.5%21 models	81.8%18 models
DOE Cold Climate Heat Pump Challenge	13.6%3 models	4.5%1 models
ENERGY STAR Cold Climate	100%22 models	81.8%18 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

ECO AC
PERFECTAIRE
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	ECO AC	PERFECTAIRE
Ducted, up to 1.5 tons	1 · index 49%	2 · index 77%
Ducted, 2 tons	1 · index 55%	None
Ducted, 2.5–3 tons	3 · index 63%	4 · index 81%
Ducted, 3.5–4.5 tons	2 · index 74%	4 · index 83%
Non-ducted, up to 1.5 tons	10 · index 61%	12 · index 52%
Non-ducted, 2 tons	4 · index 55%	2 · index 47%
Non-ducted, 2.5–3 tons	4 · index 52%	4 · index 55%
Non-ducted, 3.5–4.5 tons	2 · index 62%	4 · index 60%

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	ECO ACCold-climate score, best model	PERFECTAIRECold-climate score, best model
Ducted, up to 1.5 tons	39.3(50 is the typical model of its size class)EMH-2O18KBB1 of 1 models qualify · AHRI 218461419	70.8(50 is the typical model of its size class) (higher)4PAMS18-HH-MZO2Also listed as 4PAMS18-HH-MZO32 of 2 models qualify · AHRI 217221808
Ducted, 2 tons	49.0(50 is the typical model of its size class)EMH-3O24KBB1 of 1 models qualify · AHRI 218461421	No models in this size class
Ducted, 2.5–3 tons	76.9(50 is the typical model of its size class)EHI-O36KBBwith ducted air handler EHI-V36KBB3 of 3 models qualify · AHRI 217258402	82.5(50 is the typical model of its size class) (higher)4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO54 of 4 models qualify · AHRI 217221814
Ducted, 3.5–4.5 tons	85.1(50 is the typical model of its size class) (higher)EHI-O60KBBwith ducted air handler EHI-V60KBB2 of 2 models qualify · AHRI 217258401	82.7(50 is the typical model of its size class)4PAMS48-HH-MZO5Also listed as 4PAMS48-HH-MZO64 of 4 models qualify · AHRI 217221817
Non-ducted, up to 1.5 tons	87.2(50 is the typical model of its size class)EHP-O09KBBwith ductless indoor unit EHP-W09KBB10 of 10 models qualify · AHRI 216772328	93.8(50 is the typical model of its size class) (higher)4PAMSHH06-SZOwith ductless indoor unit 4PAMSHH06-UVW8 of 12 models qualify · AHRI 217221802
Non-ducted, 2 tons	67.5(50 is the typical model of its size class)EMH-3O24KBB3 of 4 models qualify · AHRI 216772340	77.2(50 is the typical model of its size class) (higher)4PAMSHH24-SZOwith ductless indoor unit 4PAMSHH24-UVW2 of 2 models qualify · AHRI 217221806
Non-ducted, 2.5–3 tons	77.2(50 is the typical model of its size class) (higher)EMH-4O36KBB4 of 4 models qualify · AHRI 216772342	72.6(50 is the typical model of its size class)4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO54 of 4 models qualify · AHRI 217221815
Non-ducted, 3.5–4.5 tons	66.5(50 is the typical model of its size class)EMH-5O42KBB2 of 2 models qualify · AHRI 216772343	69.9(50 is the typical model of its size class) (higher)4PAMS55-HH-MZO5Also listed as 4PAMS55-HH-MZO64 of 4 models qualify · AHRI 217221821

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	ECO ACAll-around score, best model	PERFECTAIREAll-around score, best model
Ducted, up to 1.5 tons	48.6(50 is the typical model of its size class)EMH-2O18KBB1 of 1 models have all five ratings · AHRI 218461419	77.4(50 is the typical model of its size class) (higher)4PAMS18-HH-MZO2Also listed as 4PAMS18-HH-MZO32 of 2 models have all five ratings · AHRI 217221808
Ducted, 2 tons	72.4(50 is the typical model of its size class)EHI-O36KBBwith ducted air handler EHI-V24KBB2 of 2 models have all five ratings · AHRI 217452744	No models in this size class
Ducted, 2.5–3 tons	61.6(50 is the typical model of its size class)EMH-4O30KBB2 of 2 models have all five ratings · AHRI 218461417	83.6(50 is the typical model of its size class) (higher)4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO54 of 4 models have all five ratings · AHRI 217221814
Ducted, 3.5–4.5 tons	83.1(50 is the typical model of its size class)EHI-O60KBBwith ducted air handler EHI-V48KBB2 of 2 models have all five ratings · AHRI 217452743	83.9(50 is the typical model of its size class) (higher)4PAMS48-HH-MZO5Also listed as 4PAMS48-HH-MZO64 of 4 models have all five ratings · AHRI 217221817
Non-ducted, up to 1.5 tons	92.6(50 is the typical model of its size class)EHP-O09KBBwith ductless indoor unit EHP-W09KBB10 of 10 models have all five ratings · AHRI 216772328	93.8(50 is the typical model of its size class) (higher)4PAMSHH06-SZOwith ductless indoor unit 4PAMSHH06-UVW12 of 12 models have all five ratings · AHRI 217221802
Non-ducted, 2 tons	78.1(50 is the typical model of its size class) (higher)EHP-O24KBBwith ductless indoor unit EHP-W24KBB4 of 4 models have all five ratings · AHRI 216772325	72.9(50 is the typical model of its size class)4PAMSHH24-SZOwith ductless indoor unit 4PAMSHH24-UVW2 of 2 models have all five ratings · AHRI 217221806
Non-ducted, 2.5–3 tons	70.5(50 is the typical model of its size class) (higher)EMH-4O30KBB4 of 4 models have all five ratings · AHRI 216772341	66.3(50 is the typical model of its size class)4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO54 of 4 models have all five ratings · AHRI 217221813
Non-ducted, 3.5–4.5 tons	67.7(50 is the typical model of its size class) (higher)EMH-5O42KBB2 of 2 models have all five ratings · AHRI 216772343	62.6(50 is the typical model of its size class)4PAMS55-HH-MZO5Also listed as 4PAMS55-HH-MZO64 of 4 models have all five ratings · AHRI 217221819

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	ECO AC	PERFECTAIRE
COP at 5°F	beats 88% · 2.10EMH-4O36KBBNon-ducted, 2.5–3 tons	beats 91% · 2.294PAMSHH06-SZONon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 94% · 100%EHP-O24KBBNon-ducted, 2 tons	beats 95% · 104%4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO5Non-ducted, 2.5–3 tons
HSPF2	beats 90% · 10.5EHI-O60KBBDucted, 3.5–4.5 tons	beats 99% · 11.04PAMS48-HH-MZO5Also listed as 4PAMS48-HH-MZO6Ducted, 3.5–4.5 tons
SEER2	beats 99% · 27.0EHP-O24KBBNon-ducted, 2 tons	beats 96% · 20.44PAMS48-HH-MZO5Also listed as 4PAMS48-HH-MZO6Ducted, 3.5–4.5 tons
EER2	beats 98% · 16.8EHP-O09KBBNon-ducted, up to 1.5 tons	beats 96% · 16.04PAMSHH06-SZONon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 98% · 54,000 Btu/hEHI-O60KBBDucted, 3.5–4.5 tons	beats 94% · 37,400 Btu/h4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO5Non-ducted, 2.5–3 tons

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ECO AC vs PERFECTAIRE heat pumps