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NG Trade vs WILLIS heat pumps

Measured against models of the same size and duct type, NG Trade scores higher on 4 of the 6 ratings. NG Trade has 15 outdoor models, WILLIS has 15 outdoor models. NG Trade and WILLIS 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.
NG Trade and WILLIS 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, NG Trade scores higher on 4 of the 6 ratings.
  • NG Trade
  • WILLIS
  • Other ranked manufacturers
NG TradeWILLIS

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingNG TradeWILLIS
Efficiency index55% (higher)median —51% (higher)median —
COP at 5°F48% (higher)median 1.9039% (higher)median 1.84
Capacity retention at 5°F39%median 67%64%median 76%
HSPF259% (higher)median 9.252% (higher)median 9.0
SEER267% (higher)median 21.455% (higher)median 21.0
EER255% (higher)median 12.246% (higher)median 12.0
Heating capacity at 5°F42%median 12,600 Btu/h68%median 13,600 Btu/h
Outdoor models1515
AHRI certifications2529

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardNG TradeWILLIS
CEE 2025 Tier 1 (Split ASHP)80%12 models86.7%13 models
CEE 2026 Tier 1 (Split ASHP)73.3%11 models80%12 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)46.7%7 models86.7%13 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate33.3%5 models73.3%11 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 · 6 groups where both have models
  • NG Trade
  • WILLIS
  • All models of the group
Ducted, up to 1.5 tons2.00884 modelsDucted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsNon-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsNon-ducted, 3.5–4.5 tons1.97438 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 typeNG TradeWILLIS
Ducted, up to 1.5 tons1 · index 59%1 · index 32%
Ducted, 2.5–3 tons2 · index 64%4 · index 51%
Ducted, 3.5–4.5 tons1 · index 64%2 · index 55%
Ducted, 2 tonsNone1 · index 46%
Non-ducted, up to 1.5 tons9 · index 55%8 · index 44%
Non-ducted, 2 tons2 · index 47%1 · index 72%
Non-ducted, 2.5–3 tons3 · index 52%3 · index 68%
Non-ducted, 3.5–4.5 tons1 · index 48%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 typeNG TradeCold-climate score, best modelWILLISCold-climate score, best model
Ducted, up to 1.5 tons52.0(50 is the typical model of its size class) (higher)MOBMH180C1 of 1 models qualify · AHRI 21330786336.0(50 is the typical model of its size class)MZUHW18KCH21S2-O1 of 1 models qualify · AHRI 214810334
Ducted, 2 tonsNo models in this size class50.1(50 is the typical model of its size class)MZUHW24KCH21S2-O1 of 1 models qualify · AHRI 214810335
Ducted, 2.5–3 tons57.4(50 is the typical model of its size class) (higher)MOBMH270C1 of 2 models qualify · AHRI 21330786655.3(50 is the typical model of its size class)FLEX24/36KUHwith ducted air handler FLEXAH24/36K4 of 4 models qualify · AHRI 214137765
Ducted, 3.5–4.5 tonsNone on this board (0 of 1 models qualify)56.7(50 is the typical model of its size class)FLEX48/60KUHwith ducted air handler FLEXAH48/60K2 of 2 models qualify · AHRI 214797686
Non-ducted, up to 1.5 tons75.3(50 is the typical model of its size class) (higher)OMEGA181Ewith ductless indoor unit IMEGA181E4 of 9 models qualify · AHRI 21444265573.5(50 is the typical model of its size class)MZUHW18KCH21S2-O7 of 8 models qualify · AHRI 214810331
Non-ducted, 2 tons64.1(50 is the typical model of its size class)OMEGA241Ewith ductless indoor unit IMEGA241E1 of 2 models qualify · AHRI 21437780176.1(50 is the typical model of its size class) (higher)MZUHW24KCH21S2-O1 of 1 models qualify · AHRI 214810332
Non-ducted, 2.5–3 tons49.3(50 is the typical model of its size class)MOBMH270C1 of 3 models qualify · AHRI 21330786573.7(50 is the typical model of its size class) (higher)MZUHW42KCH21S2-O3 of 3 models qualify · AHRI 214810330
Non-ducted, 3.5–4.5 tonsNone on this board (0 of 1 models qualify)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 typeNG TradeAll-around score, best modelWILLISAll-around score, best model
Ducted, up to 1.5 tons59.4(50 is the typical model of its size class) (higher)MOBMH180C1 of 1 models have all five ratings · AHRI 21330786331.5(50 is the typical model of its size class)MZUHW18KCH21S2-O1 of 1 models have all five ratings · AHRI 214810334
Ducted, 2 tonsNo models in this size class45.9(50 is the typical model of its size class)MZUHW24KCH21S2-O1 of 1 models have all five ratings · AHRI 214810335
Ducted, 2.5–3 tons71.5(50 is the typical model of its size class) (higher)MOBMH270C2 of 2 models have all five ratings · AHRI 21330786653.1(50 is the typical model of its size class)MZUHW30KCH21S2-O4 of 4 models have all five ratings · AHRI 214810336
Ducted, 3.5–4.5 tons63.5(50 is the typical model of its size class) (higher)MOBMH480C1 of 1 models have all five ratings · AHRI 21386740157.4(50 is the typical model of its size class)PRT60KUH2 of 2 models have all five ratings · AHRI 214137764
Non-ducted, up to 1.5 tons84.4(50 is the typical model of its size class) (higher)OMEGA091Ewith ductless indoor unit IMEGA091E9 of 9 models have all five ratings · AHRI 21437779863.8(50 is the typical model of its size class)HW12KUHR410A-Owith ductless indoor unit HW12KUHR410A-I8 of 8 models have all five ratings · AHRI 216772615
Non-ducted, 2 tons72.2(50 is the typical model of its size class) (higher)OMEGA241Ewith ductless indoor unit IMEGA241E2 of 2 models have all five ratings · AHRI 21437780171.5(50 is the typical model of its size class)MZUHW24KCH21S2-O1 of 1 models have all five ratings · AHRI 214810332
Non-ducted, 2.5–3 tons66.7(50 is the typical model of its size class)MOBMH270C3 of 3 models have all five ratings · AHRI 21330786570.2(50 is the typical model of its size class) (higher)MZUHW42KCH21S2-O3 of 3 models have all five ratings · AHRI 214810330
Non-ducted, 3.5–4.5 tons48.3(50 is the typical model of its size class)MOBMH480C1 of 1 models have all five ratings · AHRI 213867400No 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
RatingNG TradeWILLIS
COP at 5°Fbeats 96% · 2.22OMEGA241ENon-ducted, 2 tonsbeats 90% · 2.23MZUHW18KCH21S2-ONon-ducted, up to 1.5 tons
Capacity retention at 5°Fbeats 78% · 99%OMEGA181ENon-ducted, up to 1.5 tonsbeats 85% · 89%MZUHW30KCH21S2-ODucted, 2.5–3 tons
HSPF2beats 95% · 9.7MOBMH480CDucted, 3.5–4.5 tonsbeats 82% · 10.0MZUHW36KCH21S2-ONon-ducted, 2.5–3 tons
SEER2beats 98% · 21.0MOBMH270CDucted, 2.5–3 tonsbeats 83% · 24.0PUHW12KCH24S2-ONon-ducted, up to 1.5 tons
EER2beats 95% · 15.8OMEGA091ENon-ducted, up to 1.5 tonsbeats 84% · 12.5MZUHW30KCH21S2-ONon-ducted, 2.5–3 tons
Heating capacity at 5°Fbeats 90% · 17,742 Btu/hOMEGA181ENon-ducted, up to 1.5 tonsbeats 84% · 13,800 Btu/hMZUHW18KCH21S2-ONon-ducted, up to 1.5 tons

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