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Della vs THERMAL ZONE: heat pump ratings compared

Against heat pumps of the same size and type, a typical Della model beats 48% and a typical THERMAL ZONE model 30%. Della rates higher overall.

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

Della

48%

of similar heat pumps beaten by its typical model

About average

94 models listed

THERMAL ZONE

30%

of similar heat pumps beaten by its typical model

Well below average

101 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°FDella: Beats 43%THERMAL ZONE: Beats 40%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FDella: Beats 44%THERMAL ZONE: Beats 26%
  • Winter-long heating efficiencyHSPF2Della: Beats 50%THERMAL ZONE: Beats 23%
  • Summer-long cooling efficiencySEER2Della: Beats 55%THERMAL ZONE: Beats 24%
  • Hot-day cooling efficiencyEER2Della: Beats 41%THERMAL ZONE: Beats 31%

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

    Della
    68%
    THERMAL ZONE
    8%

  • Xcel CC

    Della
    66%
    THERMAL ZONE
    8%

  • CEE Advanced

    Della
    0%
    THERMAL ZONE
    0%

  • ENERGY STAR CC

    Della
    44%
    THERMAL ZONE
    8%

Top cold-climate picks, ductless 5 tons and up

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, 5 tons and up (57,000 Btu/h and up cooling). What size is my system?

Della

No ductless, 5 tons and up model from Della.

THERMAL ZONE

No ductless, 5 tons and up model from THERMAL ZONE.

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