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ATK vs WINDAIR: heat pump ratings compared

Against heat pumps of the same size and type, a typical ATK model beats 47% and a typical WINDAIR model 65%. WINDAIR rates higher overall.

Covers older R-410A heat pumps, no longer installed new. See models sold today · Updated

ATK

47%

of similar heat pumps beaten by its typical model

About average

13 models listed

WINDAIR

65%

of similar heat pumps beaten by its typical model

Well above average

13 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°FATK: Beats 51%WINDAIR: Beats 36%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FATK: Beats 57%WINDAIR: Beats 44%
  • Winter-long heating efficiencyHSPF2ATK: Beats 75%WINDAIR: Beats 27%
  • Summer-long cooling efficiencySEER2ATK: Beats 44%WINDAIR: Beats 37%
  • Hot-day cooling efficiencyEER2ATK: Beats 20%WINDAIR: Beats 50%

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

    ATK
    54%
    WINDAIR
    23%

  • Xcel CC

    ATK
    46%
    WINDAIR
    15%

  • CEE Advanced

    ATK
    0%
    WINDAIR
    0%

  • ENERGY STAR CC

    ATK
    0%
    WINDAIR
    0%

Top cold-climate picks, ducted up to 1.5 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, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

ATK

  1. 1ACI-AUO18SHP-Mwith ducted air handler ACI-BCO24CP17ATK1.5 tons · 18,000 Btu/h · DuctedKeeps 79% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    79% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.20 (COP at 5°F)
    Great
    Seasonal efficiency
    9.5 (HSPF2)
    Good
    64.3score / 100

WINDAIR

No ducted, up to 1.5 tons model from WINDAIR.

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