Skip to content
Rebate.Blue

Convectair vs WILLIS: heat pump ratings compared

Against heat pumps of the same size and type, a typical Convectair model beats 62% and a typical WILLIS model 51%. Convectair rates higher overall.

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

Convectair

62%

of similar heat pumps beaten by its typical model

Well above average

16 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°FConvectair: Beats 43%WILLIS: Beats 39%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FConvectair: Beats 70%WILLIS: Beats 64%
  • Winter-long heating efficiencyHSPF2Convectair: Beats 69%WILLIS: Beats 52%
  • Summer-long cooling efficiencySEER2Convectair: Beats 63%WILLIS: Beats 55%
  • Hot-day cooling efficiencyEER2Convectair: Beats 62%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

    Convectair
    75%
    WILLIS
    87%

  • Xcel CC

    Convectair
    75%
    WILLIS
    87%

  • CEE Advanced

    Convectair
    0%
    WILLIS
    0%

  • ENERGY STAR CC

    Convectair
    0%
    WILLIS
    73%

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

Convectair

  1. 18028-C09-Owith ductless indoor unit 8028-C09-IConvectair1 ton · 9,000 Btu/h · DuctlessKeeps 88% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    88% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.97 (COP at 5°F)
    Good
    Seasonal efficiency
    11.5 (HSPF2)
    Top 10%
    76.2score / 100
  2. 28028-C18-Owith ductless indoor unit 8028-C18-IConvectair1.5 tons · 18,000 Btu/h · DuctlessKeeps 100% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    100% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    11.3 (HSPF2)
    Top 10%
    67.2score / 100
  3. 38180-Owith ductless indoor unit 8180-IConvectair1.5 tons · 17,000 Btu/h · DuctlessKeeps 91% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    91% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.90 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    65.2score / 100

WILLIS

  1. 1MZUHW18KCH21S2-OWILLIS1.5 tons · 17,000 Btu/h · DuctlessKeeps 76% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    76% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.23 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    73.5score / 100
  2. 2HW12KUHR410A-Owith ductless indoor unit HW12KUHR410A-IWILLIS1 ton · 12,000 Btu/h · DuctlessKeeps 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
    2.05 (COP at 5°F)
    Good
    Seasonal efficiency
    9.5 (HSPF2)
    Good
    55.8score / 100
  3. 3PUHW12KCH24S2-Owith ductless indoor unit PUHW12KCH24S2-IWILLIS1 ton · 12,000 Btu/h · DuctlessKeeps 75% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    75% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.90 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.0 (HSPF2)
    Below the middle
    50.0score / 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