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Airdach vs WILLIS: heat pump ratings compared

Against heat pumps of the same size and type, a typical Airdach model beats 40% and a typical WILLIS model 63%. WILLIS rates higher overall.

Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated

Airdach

40%

of similar heat pumps beaten by its typical model

Below average

29 models listed

WILLIS

63%

of similar heat pumps beaten by its typical model

Well above average

29 models listed

Rating by ratingEach bar is the share of same-size, same-type heat pumps that a typical model beats, so the two brands compare fairly even if they make different sizes.
  • Efficiency on a 5°F dayCOP at 5°FAirdach: Beats 48%WILLIS: Beats 44%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FAirdach: Beats 34%WILLIS: Beats 71%
  • Winter-long heating efficiencyHSPF2Airdach: Beats 28%WILLIS: Beats 50%
  • Summer-long cooling efficiencySEER2Airdach: Beats 29%WILLIS: Beats 69%
  • Hot-day cooling efficiencyEER2Airdach: Beats 49%WILLIS: Beats 72%

Average (50%)Dashed outline: the other brand, for comparison

Want ranks, distributions per size class and cold-weather curves? Switch to Advanced

Rebate standards

Share of each brand’s models that meet the level. Programs can have other rules too.

  • CEE 2025

    Airdach
    24%
    WILLIS
    97%

  • Xcel CC

    Airdach
    31%
    WILLIS
    97%

  • CEE Advanced

    Airdach
    0%
    WILLIS
    10%

  • ENERGY STAR CC

    Airdach
    0%
    WILLIS
    86%

Top cold-climate picks, ducted 2.5–3 tons

Only units that keep at least 70% of their heat at 5°F, ranked on heat kept, efficiency at 5°F and seasonal efficiency (HSPF2), against units their size.

Showing Ducted, 2.5–3 tons (27,000–38,999 Btu/h cooling). What size is my system?

Airdach

  1. 1A3TH36180OV1DGwith ducted air handler A3DH36000OE1DTAirdach3 tons · 33,000 Btu/h · DuctedKeeps 73% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    73% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    8.8 (HSPF2)
    Good
    59.2score / 100

WILLIS

  1. 1HW-COND36Kwith ducted air handler HW-AHU36KWILLIS2.5 tons · 32,000 Btu/h · DuctedKeeps 97% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    97% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.15 (COP at 5°F)
    Great
    Seasonal efficiency
    10.5 (HSPF2)
    Top 10%
    87.9score / 100
  2. 2FLEX36KUHR32with ducted air handler FLEXAH36KR32WILLIS3 tons · 34,000 Btu/h · DuctedKeeps 100% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    100% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    10.0 (HSPF2)
    Great
    76.9score / 100
  3. 3MZUHW36KR32-OWILLIS3 tons · 36,000 Btu/h · DuctedKeeps 92% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    92% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.90 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    8.1 (HSPF2)
    Below the middle
    52.2score / 100

These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.

Next steps

The advanced view adds ranks, both brands’ models inside every size class, standout models per rating and cold-weather curves.

Open the advanced view