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WILLIS vs YITAHOME heat pumps

Measured against models of the same size and duct type, WILLIS scores higher on 5 of the 6 ratings. WILLIS has 29 outdoor models, YITAHOME has 30 outdoor models. WILLIS and YITAHOME have no QMID on file and are not ranked.

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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.
WILLIS and YITAHOME 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, WILLIS scores higher on 5 of the 6 ratings.
  • WILLIS
  • YITAHOME
  • Other ranked manufacturers
WILLISYITAHOME

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingWILLISYITAHOME
Efficiency index63% (higher)median —37% (higher)median —
COP at 5°F44%median 2.0064%median 2.05
Capacity retention at 5°F71% (higher)median 90%15% (higher)median 57%
HSPF250% (higher)median 10.027% (higher)median 8.5
SEER269% (higher)median 21.041% (higher)median 20.0
EER272% (higher)median 12.531% (higher)median 11.3
Heating capacity at 5°F65% (higher)median 19,000 Btu/h28% (higher)median 7,400 Btu/h
Outdoor models2930
AHRI certifications8536

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardWILLISYITAHOME
CEE 2025 Tier 1 (Split ASHP)96.6%28 models63.3%19 models
CEE 2026 Tier 1 (Split ASHP)96.6%28 models63.3%19 models
CEE Advanced Tier (Split ASHP)10.3%3 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)96.6%28 models16.7%5 models
DOE Cold Climate Heat Pump Challenge10.3%3 models0%0 models
ENERGY STAR Cold Climate86.2%25 models0%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 · 3 groups where both have models
  • WILLIS
  • YITAHOME
  • 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 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 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 typeWILLISYITAHOME
Ducted, up to 1.5 tons7 · index 71%5 · index 48%
Ducted, 2 tons5 · index 67%None
Ducted, 2.5–3 tons3 · index 68%None
Ducted, 3.5–4.5 tons3 · index 77%None
Non-ducted, up to 1.5 tons13 · index 58%21 · index 32%
Non-ducted, 2 tons4 · index 63%4 · index 44%
Non-ducted, 2.5–3 tons6 · index 47%None
Non-ducted, 3.5–4.5 tons1 · index 68%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 typeWILLISCold-climate score, best modelYITAHOMECold-climate score, best model
Ducted, up to 1.5 tons69.9(50 is the typical model of its size class)PUHW09KR32-Owith ducted air handler WHEDT09K7 of 7 models qualify · AHRI 217560051None on this board (0 of 5 models qualify)
Ducted, 2 tons76.2(50 is the typical model of its size class)FLEX24KUHR32with ducted air handler FLEXAH24KR324 of 4 models qualify · AHRI 216720953No models in this size class
Ducted, 2.5–3 tons87.9(50 is the typical model of its size class)HW-COND36Kwith ducted air handler HW-AHU36K4 of 4 models qualify · AHRI 216772612No models in this size class
Ducted, 3.5–4.5 tons85.1(50 is the typical model of its size class)FLEX60KUHR32with ducted air handler FLEXAH60KR323 of 3 models qualify · AHRI 216720958No models in this size class
Non-ducted, up to 1.5 tons87.2(50 is the typical model of its size class) (higher)AUHW09KR32-Owith ductless indoor unit AUHW09KR32-I13 of 13 models qualify · AHRI 21700796362.5(50 is the typical model of its size class)IMHCAC-00324 of 21 models qualify · AHRI 215400251
Non-ducted, 2 tons70.3(50 is the typical model of its size class) (higher)PUHW24KR32-Owith ductless indoor unit PUHW24KR32-I3 of 4 models qualify · AHRI 21700796265.7(50 is the typical model of its size class)IMHCAC-00341 of 4 models qualify · AHRI 215792835
Non-ducted, 2.5–3 tons77.2(50 is the typical model of its size class)MZUHW36KR32-O6 of 6 models qualify · AHRI 216772311No models in this size class
Non-ducted, 3.5–4.5 tons66.5(50 is the typical model of its size class)MZUHW42KR32-O1 of 1 models qualify · AHRI 216772312No 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 typeWILLISAll-around score, best modelYITAHOMEAll-around score, best model
Ducted, up to 1.5 tons83.6(50 is the typical model of its size class) (higher)PUHW09KR32-Owith ducted air handler WHEDT09K7 of 7 models have all five ratings · AHRI 21756005147.7(50 is the typical model of its size class)YSAA12DN2AU-Wwith ducted air handler YSAA12DN2AU-NAlso listed as YSAA12DL2AU-W, YSAA12DR2AU-W, YSAA12DH2AU-W, YSAA12DT2AU-W5 of 5 models have all five ratings · AHRI 217992337
Ducted, 2 tons73.1(50 is the typical model of its size class)FLEX24KUHR32with ducted air handler FLEXAH24KR325 of 5 models have all five ratings · AHRI 216720953No models in this size class
Ducted, 2.5–3 tons82.3(50 is the typical model of its size class)HW-COND36Kwith ducted air handler HW-AHU36K3 of 3 models have all five ratings · AHRI 216772612No models in this size class
Ducted, 3.5–4.5 tons83.1(50 is the typical model of its size class)FLEX48KUHR32with ducted air handler FLEXAH48KR32Also listed as FLEX60KUHR323 of 3 models have all five ratings · AHRI 216720956No models in this size class
Non-ducted, up to 1.5 tons92.6(50 is the typical model of its size class) (higher)AUHW09KR32-Owith ductless indoor unit AUHW09KR32-I13 of 13 models have all five ratings · AHRI 21700796358.7(50 is the typical model of its size class)IMHCAC-003218 of 21 models have all five ratings · AHRI 215400251
Non-ducted, 2 tons82.1(50 is the typical model of its size class) (higher)PUHW24KR32-Owith ductless indoor unit PUHW24KR32-I4 of 4 models have all five ratings · AHRI 21700796270.9(50 is the typical model of its size class)IMHCAC-00344 of 4 models have all five ratings · AHRI 215792835
Non-ducted, 2.5–3 tons70.5(50 is the typical model of its size class)MZUHW30KR32-O6 of 6 models have all five ratings · AHRI 216772310No models in this size class
Non-ducted, 3.5–4.5 tons67.7(50 is the typical model of its size class)MZUHW42KR32-O1 of 1 models have all five ratings · AHRI 216772312No 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
RatingWILLISYITAHOME
COP at 5°Fbeats 88% · 2.10MZUHW36KR32-ONon-ducted, 2.5–3 tonsbeats 98% · 2.50YSAA09DH1AU-WNon-ducted, up to 1.5 tons
Capacity retention at 5°Fbeats 94% · 100%AUHW24KR32-ONon-ducted, 2 tonsbeats 73% · 85%IMHCAC-0034Non-ducted, 2 tons
HSPF2beats 96% · 10.5HW-COND36KDucted, 2.5–3 tonsbeats 69% · 10.0IMHCAC-0014Non-ducted, 2 tons
SEER2beats 100% · 24.5AUHW18KR32-ODucted, up to 1.5 tonsbeats 82% · 20.0YSAA12DN2AU-WAlso listed as YSAA12DL2AU-W, YSAA12DR2AU-W, YSAA12DH2AU-W, YSAA12DT2AU-WDucted, up to 1.5 tons
EER2beats 98% · 16.8AUHW09KR32-ONon-ducted, up to 1.5 tonsbeats 68% · 12.5IMHCAC-0034Non-ducted, 2 tons
Heating capacity at 5°Fbeats 98% · 54,000 Btu/hFLEX60KUHR32Ducted, 3.5–4.5 tonsbeats 83% · 14,000 Btu/hIMHCAC-0032Non-ducted, up to 1.5 tons

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