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Dettson vs Relief Sciences: heat pump ratings compared

Against heat pumps of the same size and type, a typical Dettson model beats 52% 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

Dettson

52%

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°FDettson: Beats 55%Relief Sciences: Beats 38%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FDettson: Beats 71%Relief Sciences: Beats 72%
  • Winter-long heating efficiencyHSPF2Dettson: Beats 78%Relief Sciences: Beats 73%
  • Summer-long cooling efficiencySEER2Dettson: Beats 42%Relief Sciences: Beats 76%
  • Hot-day cooling efficiencyEER2Dettson: Beats 30%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

    Dettson
    60%
    Relief Sciences
    100%

  • Xcel CC

    Dettson
    80%
    Relief Sciences
    90%

  • CEE Advanced

    Dettson
    0%
    Relief Sciences
    0%

  • ENERGY STAR CC

    Dettson
    100%
    Relief Sciences
    0%

Top cold-climate picks, ducted 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 Ducted, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

Dettson

  1. 1EVD-24-O*with ducted air handler MAC24H1418EDettson1.5 tons · 20,000 Btu/h · DuctedKeeps 80% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    80% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    10.2 (HSPF2)
    Great
    65.2score / 100
  2. 2EVD-18-Owith ducted air handler MAC24H1718EDettson1.5 tons · 18,000 Btu/h · DuctedKeeps 79% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    79% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.20 (COP at 5°F)
    Great
    Seasonal efficiency
    9.5 (HSPF2)
    Good
    63.7score / 100
  3. 3MHD-18with ducted air handler MHD-CC2.0-17.5-MDettson1.5 tons · 18,000 Btu/h · DuctedKeeps 75% of its heat at 5°FMeets Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    75% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.21 (COP at 5°F)
    Great
    Seasonal efficiency
    9.5 (HSPF2)
    Good
    62.6score / 100

Relief Sciences

  1. 1LANG18OD35-2Relief Sciences1.5 tons · 19,000 Btu/h · DuctedKeeps 105% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    105% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    1.83 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.3 (HSPF2)
    Below the middle
    52.0score / 100
  2. 2LANG24OD25-2Relief Sciences1.5 tons · 18,000 Btu/h · DuctedKeeps 74% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    74% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    1.86 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.8 (HSPF2)
    Good
    46.5score / 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