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DUCTLESSAIRE vs Relief Sciences: heat pump ratings compared

Against heat pumps of the same size and type, a typical DUCTLESSAIRE model beats 51% and a typical Relief Sciences model 66%. Relief Sciences rates higher overall.

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

DUCTLESSAIRE

51%

of similar heat pumps beaten by its typical model

About average

10 models listed

Relief Sciences

66%

of similar heat pumps beaten by its typical model

Well above average

10 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°FDUCTLESSAIRE: Beats 47%Relief Sciences: Beats 38%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FDUCTLESSAIRE: Beats 36%Relief Sciences: Beats 72%
  • Winter-long heating efficiencyHSPF2DUCTLESSAIRE: Beats 54%Relief Sciences: Beats 73%
  • Summer-long cooling efficiencySEER2DUCTLESSAIRE: Beats 61%Relief Sciences: Beats 76%
  • Hot-day cooling efficiencyEER2DUCTLESSAIRE: Beats 49%Relief Sciences: Beats 67%

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

    DUCTLESSAIRE
    60%
    Relief Sciences
    100%

  • Xcel CC

    DUCTLESSAIRE
    40%
    Relief Sciences
    90%

  • CEE Advanced

    DUCTLESSAIRE
    0%
    Relief Sciences
    0%

  • ENERGY STAR CC

    DUCTLESSAIRE
    20%
    Relief Sciences
    0%

Top cold-climate picks, ducted 2.5–3 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 Ducted, 2.5–3 tons (27,000–38,999 Btu/h cooling), the most-listed ducted size. Pick yours above. What size is my system?

DUCTLESSAIRE

  1. 1DA27-3Z-0*DUCTLESSAIRE2.5 tons · 28,000 Btu/h · DuctedKeeps 71% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    71% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.83 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.2 (HSPF2)
    Good
    57.4score / 100

Relief Sciences

  1. 1LANG27OD35-3Relief Sciences2.5 tons · 28,000 Btu/h · DuctedKeeps 90% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    90% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    1.76 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.5 (HSPF2)
    Great
    65.0score / 100
  2. 2LANG36OD35-4Relief Sciences3 tons · 36,000 Btu/h · DuctedKeeps 89% of its heat at 5°FMeets none of the standards tracked here
    Heat kept at 5°F
    89% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.70 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.0 (HSPF2)
    Top 10%
    64.2score / 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.

Open the advanced view