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AIRTEMP vs DIAMONDAIR: heat pump ratings compared

Against heat pumps of the same size and type, a typical AIRTEMP model beats 45% and a typical DIAMONDAIR model 42%. AIRTEMP rates slightly higher overall.

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

AIRTEMP

45%

of similar heat pumps beaten by its typical model

About average

25 models listed

DIAMONDAIR

42%

of similar heat pumps beaten by its typical model

Below average

25 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°FAIRTEMP: Beats 32%DIAMONDAIR: Beats 30%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FAIRTEMP: Beats 65%DIAMONDAIR: Beats 34%
  • Winter-long heating efficiencyHSPF2AIRTEMP: Beats 37%DIAMONDAIR: Beats 42%
  • Summer-long cooling efficiencySEER2AIRTEMP: Beats 38%DIAMONDAIR: Beats 38%
  • Hot-day cooling efficiencyEER2AIRTEMP: Beats 44%DIAMONDAIR: Beats 53%

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

    AIRTEMP
    48%
    DIAMONDAIR
    36%

  • Xcel CC

    AIRTEMP
    52%
    DIAMONDAIR
    24%

  • CEE Advanced

    AIRTEMP
    0%
    DIAMONDAIR
    0%

  • ENERGY STAR CC

    AIRTEMP
    32%
    DIAMONDAIR
    0%

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?

AIRTEMP

  1. 1GXH18(5.3)FMK4DH-1AIRTEMP1.5 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
    2.21 (COP at 5°F)
    Great
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    73.1score / 100
  2. 2GXH18(5.3)LSK4DH2with ductless indoor unit GKH18(5.3)FMK4DH1AIRTEMP1.5 tons · 18,000 Btu/h · DuctlessKeeps 81% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    81% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.93 (COP at 5°F)
    Good
    Seasonal efficiency
    8.5 (HSPF2)
    Below the middle
    47.2score / 100
  3. 3GXH12(3.5)LSK4DH2with ductless indoor unit GHH12(3.5)LUK4DH2AIRTEMP1 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
    1.84 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.0 (HSPF2)
    Below the middle
    45.7score / 100

DIAMONDAIR

  1. 1D2009SHO2with ductless indoor unit DF2009HMSI2DIAMONDAIR1 ton · 9,000 Btu/h · DuctlessKeeps 94% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    94% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.90 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    11.6 (HSPF2)
    Top 10%
    74.8score / 100
  2. 2D2018SHO2with ductless indoor unit DF2018HMSI2DIAMONDAIR1.5 tons · 18,000 Btu/h · DuctlessKeeps 96% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    96% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.89 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.6 (HSPF2)
    Great
    70.2score / 100
  3. 3D2012SHO2with ductless indoor unit DF2012HMSI2DIAMONDAIR1 ton · 12,000 Btu/h · DuctlessKeeps 92% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    92% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.89 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.5 (HSPF2)
    Great
    68.2score / 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.

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