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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, ducted 3.5–4.5 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, 3.5–4.5 tons (39,000–56,999 Btu/h cooling). What size is my system?

BOSTON AC

No ducted, 3.5–4.5 tons model from BOSTON AC.

GSI

  1. 1SOE30U-55HFN1-Mwith ducted air handler SAC-60HWDN1-MN0GSI4.5 tons · 53,000 Btu/h · DuctedKeeps 85% of its heat at 5°FMeets none of the standards tracked here
    Heat kept at 5°F
    85% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    8.6 (HSPF2)
    Good
    58.3score / 100
  2. 2SOE30U-48HFN1-M-[X1]with ducted air handler SAC-48HWDN1-MN0GSI4 tons · 46,000 Btu/h · DuctedKeeps 78% of its heat at 5°FMeets none of the standards tracked here
    Heat kept at 5°F
    78% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.0 (HSPF2)
    Good
    57.4score / 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