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DiamondAir vs Nutech: 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

DiamondAir

—

of similar heat pumps beaten by its typical model

Not enough rated models

7 models listed

Nutech

54%

of similar heat pumps beaten by its typical model

About average

28 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°FDiamondAir: Not ratedNutech: Beats 58%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FDiamondAir: Not ratedNutech: Beats 42%
  • Winter-long heating efficiencyHSPF2DiamondAir: Beats 26%Nutech: Beats 60%
  • Summer-long cooling efficiencySEER2DiamondAir: Beats 21%Nutech: Beats 64%
  • Hot-day cooling efficiencyEER2DiamondAir: Beats 60%Nutech: Beats 43%

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

    DiamondAir
    0%
    Nutech
    86%

  • Xcel CC

    DiamondAir
    0%
    Nutech
    61%

  • CEE Advanced

    DiamondAir
    0%
    Nutech
    0%

  • ENERGY STAR CC

    DiamondAir
    0%
    Nutech
    0%

All-around best, ducted 3.5–4.5 tons

Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating against units their size.

Showing Ducted, 3.5–4.5 tons (39,000–56,999 Btu/h cooling). What size is my system?

DiamondAir

None of DiamondAir’s ducted, 3.5–4.5 tons models has all five ratings.

Nutech

  1. 1N6OE30-48HFN10-M1D-DNutech4 tons · 45,000 Btu/h · DuctedCold-climate pick, score 77.9Meets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    81% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Good
    Winter efficiency
    10.6 (HSPF2)
    Top 10%
    Cooling efficiency
    20.4 (SEER2)
    Top 10%
    Hot-day cooling
    12.0 (EER2)
    Great
    85.1score / 100Heating 78 · Cooling 92
  2. 2NWDB-48HI1N4S4-M-SE18Nutech4 tons · 48,000 Btu/h · DuctedCold-climate pick, score 60.3Meets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    93% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Winter efficiency
    9.0 (HSPF2)
    Good
    Cooling efficiency
    19.0 (SEER2)
    Great
    Hot-day cooling
    11.2 (EER2)
    Good
    65.5score / 100Heating 60 · Cooling 71
  3. 3NWDB-60HI1N4S4-M-SE18Nutech4.5 tons · 55,000 Btu/h · DuctedCold-climate pick, score 55.5Meets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    81% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.82 (COP at 5°F)
    Below the middle
    Winter efficiency
    8.8 (HSPF2)
    Good
    Cooling efficiency
    18.5 (SEER2)
    Great
    Hot-day cooling
    10.6 (EER2)
    Below the middle
    57.2score / 100Heating 56 · Cooling 59

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