Coast Air vs GSI: heat pump ratings compared
Against heat pumps of the same size and type, a typical Coast Air model beats 50% and a typical GSI model 48%. Coast Air rates slightly higher overall.
Covers older R-410A heat pumps, no longer installed new. See models sold today · Updated
Coast Air
50%
of similar heat pumps beaten by its typical model
About average6 models listed
GSI
48%
of similar heat pumps beaten by its typical model
About average6 models listed
- Efficiency on a 5°F dayCOP at 5°FCoast Air: Beats 52%GSI: Beats 48%
- Heating power kept at 5°FCapacity at 5°F vs 47°FCoast Air: Beats 16%GSI: Beats 70%
- Winter-long heating efficiencyHSPF2Coast Air: Beats 46%GSI: Beats 78%
- Summer-long cooling efficiencySEER2Coast Air: Beats 54%GSI: Beats 37%
- Hot-day cooling efficiencyEER2Coast Air: Beats 48%GSI: Beats 24%
Average (50%)Dashed outline: the other brand, for comparison
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Rebate standards
CEE 2025
- Coast Air
- 67%
- GSI
- 33%
Xcel CC
- Coast Air
- 0%
- GSI
- 67%
CEE Advanced
- Coast Air
- 0%
- GSI
- 0%
ENERGY STAR CC
- Coast Air
- 0%
- GSI
- 0%
Top cold-climate picks, ductless 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 Ductless, 2.5–3 tons (27,000–38,999 Btu/h cooling). What size is my system?
Coast Air
None of Coast Air’s ductless, 2.5–3 tons models qualifies.
GSI
No ductless, 2.5–3 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.
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