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AIRTEMP vs DiamondAir: heat pump ratings compared

One of these brands has too few models with every rating for an overall score; see each rating below.

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

AIRTEMP

36%

of similar heat pumps beaten by its typical model

Well below average

47 models listed

DiamondAir

—

of similar heat pumps beaten by its typical model

Not enough rated models

7 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 25%DiamondAir: Not rated
  • Heating power kept at 5°FCapacity at 5°F vs 47°FAIRTEMP: Beats 37%DiamondAir: Not rated
  • Winter-long heating efficiencyHSPF2AIRTEMP: Beats 30%DiamondAir: Beats 26%
  • Summer-long cooling efficiencySEER2AIRTEMP: Beats 35%DiamondAir: Beats 21%
  • Hot-day cooling efficiencyEER2AIRTEMP: Beats 48%DiamondAir: Beats 60%

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
    43%
    DiamondAir
    0%

  • Xcel CC

    AIRTEMP
    40%
    DiamondAir
    0%

  • CEE Advanced

    AIRTEMP
    4%
    DiamondAir
    0%

  • ENERGY STAR CC

    AIRTEMP
    26%
    DiamondAir
    0%

Top cold-climate picks, ductless 3.5–4.5 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, 3.5–4.5 tons (39,000–56,999 Btu/h cooling). What size is my system?

AIRTEMP

  1. 1DXH42FMK3IHAIRTEMP3.5 tons · 42,000 Btu/h · DuctlessKeeps 90% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    90% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Great
    Seasonal efficiency
    10.0 (HSPF2)
    Below the middle
    66.5score / 100

DiamondAir

No ductless, 3.5–4.5 tons model from DiamondAir.

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