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BOSTON AC vs GSI: heat pump ratings compared

Against heat pumps of the same size and type, a typical BOSTON AC model beats 56% and a typical GSI model 48%. BOSTON AC rates higher overall.

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

BOSTON AC

56%

of similar heat pumps beaten by its typical model

Above average

6 models listed

GSI

48%

of similar heat pumps beaten by its typical model

About average

6 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°FBOSTON AC: Beats 55%GSI: Beats 48%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FBOSTON AC: Beats 52%GSI: Beats 70%
  • Winter-long heating efficiencyHSPF2BOSTON AC: Beats 45%GSI: Beats 78%
  • Summer-long cooling efficiencySEER2BOSTON AC: Beats 65%GSI: Beats 37%
  • Hot-day cooling efficiencyEER2BOSTON AC: Beats 59%GSI: Beats 24%

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

    BOSTON AC
    100%
    GSI
    33%

  • Xcel CC

    BOSTON AC
    83%
    GSI
    67%

  • CEE Advanced

    BOSTON AC
    0%
    GSI
    0%

  • ENERGY STAR CC

    BOSTON AC
    0%
    GSI
    0%

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

BOSTON AC

  1. 1BA12HCT23X2Owith ductless indoor unit BA12HCT23X2IBOSTON AC1 ton · 12,000 Btu/h · DuctlessKeeps 76% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    76% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.18 (COP at 5°F)
    Great
    Seasonal efficiency
    9.5 (HSPF2)
    Good
    68.8score / 100
  2. 2BA12HCT22X1Owith ductless indoor unit BA12HCT22X1IBOSTON AC1 ton · 12,000 Btu/h · DuctlessKeeps 75% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    75% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.19 (COP at 5°F)
    Great
    Seasonal efficiency
    9.0 (HSPF2)
    Below the middle
    62.5score / 100
  3. 3BA18HCT22X2Owith ductless indoor unit BA18HCT22X2IBOSTON AC1.5 tons · 18,000 Btu/h · DuctlessKeeps 70% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    70% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.21 (COP at 5°F)
    Great
    Seasonal efficiency
    9.0 (HSPF2)
    Below the middle
    56.5score / 100

GSI

No ductless, up to 1.5 tons model from GSI.

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