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PERFECTAIRE vs Wells heat pumps

Measured against models of the same size and duct type, PERFECTAIRE and Wells split the 6 ratings 3–3. PERFECTAIRE has 22 outdoor models, Wells has 37 outdoor models. PERFECTAIRE and Wells have no QMID on file and are not ranked. They share hardware: 26 equipment families appear under both names.

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CompareData as of updated · sources

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.
PERFECTAIRE and Wells 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 and Wells split the 6 ratings 3–3.
  • PERFECTAIRE
  • Wells
  • Other ranked manufacturers
PERFECTA…Wells

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingPERFECTAIREWells
Efficiency index62%median —63%median —
COP at 5°F55%median 2.0064%median 2.10
Capacity retention at 5°F71% (higher)median 94%61% (higher)median 75%
HSPF271%median 10.174%median 10.0
SEER257%median 20.062%median 19.4
EER261% (higher)median 12.059% (higher)median 12.0
Heating capacity at 5°F70% (higher)median 18,000 Btu/h62% (higher)median 19,000 Btu/h
Outdoor models2237
AHRI certifications42121

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardPERFECTAIREWells
CEE 2025 Tier 1 (Split ASHP)81.8%18 models86.5%32 models
CEE 2026 Tier 1 (Split ASHP)77.3%17 models83.8%31 models
CEE Advanced Tier (Split ASHP)4.5%1 models2.7%1 models
Xcel Energy Colorado cold-climate ASHP (2025)81.8%18 models81.1%30 models
DOE Cold Climate Heat Pump Challenge4.5%1 models2.7%1 models
ENERGY STAR Cold Climate81.8%18 models83.8%31 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
  • PERFECTAIRE
  • Wells
  • All models of the group
Ducted, up to 1.5 tons1.901,783 modelsDucted, 2 tons2.001,090 modelsDucted, 2.5–3 tons2.001,909 modelsDucted, 3.5–4.5 tons2.002,224 modelsDucted, 5 tons and up2.00321 modelsNon-ducted, up to 1.5 tons1.953,455 modelsNon-ducted, 2 tons2.00863 modelsNon-ducted, 2.5–3 tons2.001,106 modelsNon-ducted, 3.5–4.5 tons2.00564 modelsNon-ducted, 5 tons and up2.0585 modelsmedian

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

Source: AHRI Directory · as of

Models per peer group · efficiency index within the group
Size and duct typePERFECTAIREWells
Ducted, up to 1.5 tons2 · index 77%9 · index 80%
Ducted, 2.5–3 tons4 · index 81%7 · index 67%
Ducted, 3.5–4.5 tons4 · index 83%7 · index 63%
Ducted, 2 tonsNone5 · index 73%
Ducted, 5 tons and upNone1 · index 63%
Non-ducted, up to 1.5 tons12 · index 52%16 · index 58%
Non-ducted, 2 tons2 · index 47%4 · index 53%
Non-ducted, 2.5–3 tons4 · index 55%4 · index 54%
Non-ducted, 3.5–4.5 tons4 · index 60%3 · index 57%
Non-ducted, 5 tons and upNone1 · index 27%

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 typePERFECTAIRECold-climate score, best modelWellsCold-climate score, best model
Ducted, up to 1.5 tons70.8(50 is the typical model of its size class)4PAMS18-HH-MZO2Also listed as 4PAMS18-HH-MZO32 of 2 models qualify · AHRI 21722180893.5(50 is the typical model of its size class) (higher)WOS-06PRE/230with ducted air handler WIDL-06MOC/2309 of 9 models qualify · AHRI 215864077
Ducted, 2 tonsNo models in this size class85.7(50 is the typical model of its size class)WOS-24PRE/230with ducted air handler WIDH-24MOC/2305 of 5 models qualify · AHRI 215864084
Ducted, 2.5–3 tons82.5(50 is the typical model of its size class)4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO54 of 4 models qualify · AHRI 21722181482.5(50 is the typical model of its size class)WOM-36HH5/2307 of 7 models qualify · AHRI 215864112
Ducted, 3.5–4.5 tons82.7(50 is the typical model of its size class)4PAMS48-HH-MZO5Also listed as 4PAMS48-HH-MZO64 of 4 models qualify · AHRI 21722181782.7(50 is the typical model of its size class)WOM-48HH6/2307 of 7 models qualify · AHRI 215864115
Ducted, 5 tons and upNo models in this size classNone on this board (0 of 1 models qualify)
Non-ducted, up to 1.5 tons93.8(50 is the typical model of its size class)4PAMSHH06-SZOwith ductless indoor unit 4PAMSHH06-UVW8 of 12 models qualify · AHRI 21722180294.4(50 is the typical model of its size class) (higher)WOS-06PRE/230with ductless indoor unit WI1C-06MOC/23011 of 16 models qualify · AHRI 215864073
Non-ducted, 2 tons77.2(50 is the typical model of its size class)4PAMSHH24-SZOwith ductless indoor unit 4PAMSHH24-UVW2 of 2 models qualify · AHRI 21722180689.4(50 is the typical model of its size class) (higher)WOS-24PRE/230with ductless indoor unit WI4C-24MOC/2304 of 4 models qualify · AHRI 215864072
Non-ducted, 2.5–3 tons72.6(50 is the typical model of its size class)4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO54 of 4 models qualify · AHRI 21722181572.6(50 is the typical model of its size class)WOM-36HH5/2304 of 4 models qualify · AHRI 215864113
Non-ducted, 3.5–4.5 tons69.9(50 is the typical model of its size class)4PAMS55-HH-MZO5Also listed as 4PAMS55-HH-MZO64 of 4 models qualify · AHRI 21722182169.9(50 is the typical model of its size class)WOM-60HH6/2303 of 3 models qualify · AHRI 215864119
Non-ducted, 5 tons and upNo models in this size classNone on this board (0 of 1 models qualify)

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 typePERFECTAIREAll-around score, best modelWellsAll-around score, best model
Ducted, up to 1.5 tons77.4(50 is the typical model of its size class)4PAMS18-HH-MZO2Also listed as 4PAMS18-HH-MZO32 of 2 models have all five ratings · AHRI 21722180895.0(50 is the typical model of its size class) (higher)WOS-06PRE/230with ducted air handler WIDL-06MOC/2309 of 9 models have all five ratings · AHRI 215864077
Ducted, 2 tonsNo models in this size class79.6(50 is the typical model of its size class)WDHP-2436T-Gwith ducted air handler WDAH-24MOC-G5 of 5 models have all five ratings · AHRI 217048501
Ducted, 2.5–3 tons83.6(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 21722181483.6(50 is the typical model of its size class)WOM-36HH5/2307 of 7 models have all five ratings · AHRI 215864112
Ducted, 3.5–4.5 tons83.9(50 is the typical model of its size class)4PAMS48-HH-MZO5Also listed as 4PAMS48-HH-MZO64 of 4 models have all five ratings · AHRI 21722181785.1(50 is the typical model of its size class) (higher)WOM-48RH6/2307 of 7 models have all five ratings · AHRI 215864100
Ducted, 5 tons and upNo models in this size class62.5(50 is the typical model of its size class)WOM-60RH6/2301 of 1 models have all five ratings · AHRI 215864103
Non-ducted, up to 1.5 tons93.8(50 is the typical model of its size class)4PAMSHH06-SZOwith ductless indoor unit 4PAMSHH06-UVW12 of 12 models have all five ratings · AHRI 21722180293.8(50 is the typical model of its size class)WOS-06PRE/230with ductless indoor unit WIHW-06MOC/23016 of 16 models have all five ratings · AHRI 215864044
Non-ducted, 2 tons72.9(50 is the typical model of its size class)4PAMSHH24-SZOwith ductless indoor unit 4PAMSHH24-UVW2 of 2 models have all five ratings · AHRI 21722180674.3(50 is the typical model of its size class) (higher)WOS-24QUA/230with ductless indoor unit WIHW-24MOC/2304 of 4 models have all five ratings · AHRI 215864043
Non-ducted, 2.5–3 tons66.3(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 21722181366.3(50 is the typical model of its size class)WOM-36HH5/2304 of 4 models have all five ratings · AHRI 215864111
Non-ducted, 3.5–4.5 tons62.6(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 21722181962.6(50 is the typical model of its size class)WOM-60HH6/2303 of 3 models have all five ratings · AHRI 215864117
Non-ducted, 5 tons and upNo models in this size class32.5(50 is the typical model of its size class)WOM-60RH6/2301 of 1 models have all five ratings · AHRI 215864102

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
RatingPERFECTAIREWells
COP at 5°Fbeats 91% · 2.294PAMSHH06-SZONon-ducted, up to 1.5 tonsbeats 99% · 2.51WOS-12QUA/230Non-ducted, up to 1.5 tons
Capacity retention at 5°Fbeats 95% · 104%4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO5Non-ducted, 2.5–3 tonsbeats 98% · 126%WOS-09PRE/230Non-ducted, up to 1.5 tons
HSPF2beats 99% · 11.04PAMS48-HH-MZO5Also listed as 4PAMS48-HH-MZO6Ducted, 3.5–4.5 tonsbeats 99% · 11.0WOM-48HH6/230Ducted, 3.5–4.5 tons
SEER2beats 96% · 20.44PAMS48-HH-MZO5Also listed as 4PAMS48-HH-MZO6Ducted, 3.5–4.5 tonsbeats 96% · 20.4WOM-48RH6/230Ducted, 3.5–4.5 tons
EER2beats 96% · 16.04PAMSHH06-SZONon-ducted, up to 1.5 tonsbeats 99% · 14.4WOS-06PRE/230Ducted, up to 1.5 tons
Heating capacity at 5°Fbeats 94% · 37,400 Btu/h4PAMS36-HH-MZO4Also listed as 4PAMS36-HH-MZO5Non-ducted, 2.5–3 tonsbeats 97% · 39,000 Btu/hWDHP-36HHDucted, 2.5–3 tons

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