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NOVAIR vs ZEPHYR: heat pump ratings compared

Against heat pumps of the same size and type, a typical NOVAIR model beats 76% and a typical ZEPHYR model 63%. NOVAIR rates higher overall.

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

NOVAIR

76%

of similar heat pumps beaten by its typical model

Well above average

42 models listed

ZEPHYR

63%

of similar heat pumps beaten by its typical model

Well above average

23 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°FNOVAIR: Beats 59%ZEPHYR: Beats 57%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FNOVAIR: Beats 75%ZEPHYR: Beats 64%
  • Winter-long heating efficiencyHSPF2NOVAIR: Beats 80%ZEPHYR: Beats 59%
  • Summer-long cooling efficiencySEER2NOVAIR: Beats 83%ZEPHYR: Beats 67%
  • Hot-day cooling efficiencyEER2NOVAIR: Beats 81%ZEPHYR: Beats 65%

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

    NOVAIR
    98%
    ZEPHYR
    100%

  • Xcel CC

    NOVAIR
    100%
    ZEPHYR
    83%

  • CEE Advanced

    NOVAIR
    5%
    ZEPHYR
    9%

  • ENERGY STAR CC

    NOVAIR
    100%
    ZEPHYR
    74%

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?

NOVAIR

  1. 1LEA48MZ6P36-ONOVAIR4 tons · 47,000 Btu/h · DuctedCold-climate pick, score 82.7Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    100% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    11.0 (HSPF2)
    Top 10%
    Cooling efficiency
    20.4 (SEER2)
    Top 10%
    Hot-day cooling
    11.7 (EER2)
    Good
    83.9score / 100Heating 83 · Cooling 85
  2. 2LEA55MZ6P36-ONOVAIR4.5 tons · 53,000 Btu/h · DuctedCold-climate pick, score 81.2Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    87% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Good
    Winter efficiency
    10.7 (HSPF2)
    Top 10%
    Cooling efficiency
    20.0 (SEER2)
    Top 10%
    Hot-day cooling
    11.7 (EER2)
    Good
    82.0score / 100Heating 81 · Cooling 83
  3. 3LEA48CEN36-Owith ducted air handler LEA48HH-CEN-INOVAIR4 tons · 48,000 Btu/h · DuctedCold-climate pick, score 76.7Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    100% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    9.5 (HSPF2)
    Great
    Cooling efficiency
    17.5 (SEER2)
    Good
    Hot-day cooling
    12.0 (EER2)
    Great
    78.4score / 100Heating 77 · Cooling 80

ZEPHYR

  1. 1ZE-648HPAwith ducted air handler AH-648AZEPHYR4 tons · 48,000 Btu/h · DuctedCold-climate pick, score 77.3Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    77% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.52 (COP at 5°F)
    Top 10%
    Winter efficiency
    9.0 (HSPF2)
    Good
    Cooling efficiency
    19.0 (SEER2)
    Great
    Hot-day cooling
    12.0 (EER2)
    Great
    82.3score / 100Heating 77 · Cooling 87
  2. 2ZE-542M525ZEPHYR3.5 tons · 42,000 Btu/h · DuctedCold-climate pick, score 50.7Meets 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
    1.80 (COP at 5°F)
    Below the middle
    Winter efficiency
    8.8 (HSPF2)
    Good
    Cooling efficiency
    18.0 (SEER2)
    Great
    Hot-day cooling
    11.4 (EER2)
    Good
    59.2score / 100Heating 51 · Cooling 68

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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