MAXI AIR vs SEA BREEZE+: heat pump ratings compared
Against heat pumps of the same size and type, a typical MAXI AIR model beats 67% and a typical SEA BREEZE+ model 66%. MAXI AIR rates slightly higher overall.
Covers older R-410A heat pumps, no longer installed new. See models sold today · Updated
MAXI AIR
67%
of similar heat pumps beaten by its typical model
Well above average19 models listed
SEA BREEZE+
66%
of similar heat pumps beaten by its typical model
Well above average19 models listed
- Efficiency on a 5°F dayCOP at 5°FMAXI AIR: Beats 41%SEA BREEZE+: Beats 46%
- Heating power kept at 5°FCapacity at 5°F vs 47°FMAXI AIR: Beats 70%SEA BREEZE+: Beats 68%
- Winter-long heating efficiencyHSPF2MAXI AIR: Beats 75%SEA BREEZE+: Beats 78%
- Summer-long cooling efficiencySEER2MAXI AIR: Beats 76%SEA BREEZE+: Beats 73%
- Hot-day cooling efficiencyEER2MAXI AIR: Beats 63%SEA BREEZE+: Beats 62%
Average (50%)Dashed outline: the other brand, for comparison
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Rebate standards
CEE 2025
- MAXI AIR
- 68%
- SEA BREEZE+
- 90%
Xcel CC
- MAXI AIR
- 74%
- SEA BREEZE+
- 84%
CEE Advanced
- MAXI AIR
- 0%
- SEA BREEZE+
- 5%
ENERGY STAR CC
- MAXI AIR
- 53%
- SEA BREEZE+
- 90%
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?
MAXI AIR
- 1YS21F-18HRDN1with ductless indoor unit YS21F-18HRDN1MAXI AIRAlso listed as NE-T52-PLA18INT1.5 tons · 18,000 Btu/h · DuctlessKeeps 70% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 70% (Capacity at 5°F vs 47°F)
- Below the middle
- Efficiency at 5°F
- 2.38 (COP at 5°F)
- Top 10%
- Seasonal efficiency
- 10.3 (HSPF2)
- Great
- 2NE-T52-SUPAE18Ewith ductless indoor unit NE-T52-SUPAE18IMAXI AIRAlso listed as NE-T53-AEG18EXT1.5 tons · 18,000 Btu/h · DuctlessKeeps 100% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 100% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 1.80 (COP at 5°F)
- Below the middle
- Seasonal efficiency
- 11.3 (HSPF2)
- Top 10%
- 3NE-T52-SUPAE12Ewith ductless indoor unit NE-T52-SUPAE12IMAXI AIRAlso listed as NE-T53-AEG12EXT1 ton · 12,000 Btu/h · DuctlessKeeps 100% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 100% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 1.80 (COP at 5°F)
- Below the middle
- Seasonal efficiency
- 10.4 (HSPF2)
- Great
SEA BREEZE+
- 1SZ9H424ZMOwith ductless indoor unit WM9H424ZMISEA BREEZE+1 ton · 9,000 Btu/h · DuctlessKeeps 86% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 86% (Capacity at 5°F vs 47°F)
- Good
- Efficiency at 5°F
- 2.22 (COP at 5°F)
- Great
- Seasonal efficiency
- 11.6 (HSPF2)
- Top 10%
- 2SZ12H424ZMOwith ductless indoor unit C12H424ZMISEA BREEZE+1 ton · 12,000 Btu/h · DuctlessKeeps 72% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 72% (Capacity at 5°F vs 47°F)
- Good
- Efficiency at 5°F
- 2.45 (COP at 5°F)
- Top 10%
- Seasonal efficiency
- 11.0 (HSPF2)
- Great
- 3HSZ12H424ZMOwith ductless indoor unit C12H424ZMISEA BREEZE+1 ton · 12,000 Btu/h · DuctlessKeeps 99% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 99% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 1.99 (COP at 5°F)
- Good
- Seasonal efficiency
- 10.7 (HSPF2)
- Great
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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