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TK'S vs WILLIS: heat pump ratings compared

Against heat pumps of the same size and type, a typical TK'S model beats 48% and a typical WILLIS model 51%. WILLIS rates slightly higher overall.

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

TK'S

48%

of similar heat pumps beaten by its typical model

About average

15 models listed

WILLIS

51%

of similar heat pumps beaten by its typical model

About average

15 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°FTK'S: Beats 34%WILLIS: Beats 39%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FTK'S: Beats 31%WILLIS: Beats 64%
  • Winter-long heating efficiencyHSPF2TK'S: Beats 58%WILLIS: Beats 52%
  • Summer-long cooling efficiencySEER2TK'S: Beats 64%WILLIS: Beats 55%
  • Hot-day cooling efficiencyEER2TK'S: Beats 47%WILLIS: Beats 46%

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

    TK'S
    67%
    WILLIS
    87%

  • Xcel CC

    TK'S
    20%
    WILLIS
    87%

  • CEE Advanced

    TK'S
    0%
    WILLIS
    0%

  • ENERGY STAR CC

    TK'S
    0%
    WILLIS
    73%

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?

TK'S

  1. 1T2C-18HFN1TK'SAlso listed as T2C-18HFN11.5 tons · 18,000 Btu/h · DuctedKeeps 70% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    70% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    9.8 (HSPF2)
    Good
    52.0score / 100

WILLIS

  1. 1MZUHW18KCH21S2-OWILLIS1.5 tons · 17,000 Btu/h · DuctedKeeps 78% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    78% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.88 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    8.1 (HSPF2)
    Below the middle
    36.0score / 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