Against comparable models

Each cell is the share of same-size, same-type models that the manufacturer’s typical model beats (50% is typical); the higher score is in bold. Raw medians are underneath for context: they depend on which sizes each one makes, so they are not compared.

OLMO and SEA BREEZE+ on every ratingPeer scores, 0–100 · grey ticks: every ranked manufacturer · shaded: the middle half of each one’s modelsMeasured against models of the same size and duct type, SEA BREEZE+ scores higher on 6 of the 6 ratings.

OLMO
SEA BREEZE+
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 11, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	OLMO	SEA BREEZE+
Efficiency index	43%median —	68%median —
COP at 5°F	45%median 1.98	65%median 2.02
Capacity retention at 5°F	40%median 74%	64%median 83%
HSPF2	33%median 9.0	78%median 10.7
SEER2	45%median 20.0	70%median 22.0
EER2	50%median 12.0	65%median 12.5
Heating capacity at 5°F	41%median 18,000 Btu/h	66%median 23,000 Btu/h
Outdoor models	11	23
AHRI certifications	17	83

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	OLMO	SEA BREEZE+
CEE 2025 Tier 1 (Split ASHP)	90.9%10 models	91.3%21 models
CEE 2026 Tier 1 (Split ASHP)	81.8%9 models	91.3%21 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	54.5%6 models	87%20 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	36.4%4 models	87%20 models

Sizes and duct types offered

Models in each peer group, with the efficiency index of those models against the rest of the group.

Side by side, inside each size and duct typeShape: every model of the group · bars: each manufacturer’s middle half, median dot, 10th–90th line · 4 groups where both have models

OLMO
SEA BREEZE+
All models of the group

Raw ratings are only placed side by side within one size and duct type, where they are comparable.

Source: AHRI Directory · as of Oct 11, 2026

Models per peer group · efficiency index within the group
Size and duct type	OLMO	SEA BREEZE+
Ducted, up to 1.5 tons	None	8 · index 78%
Ducted, 2 tons	None	3 · index 74%
Ducted, 2.5–3 tons	None	5 · index 63%
Ducted, 3.5–4.5 tons	None	3 · index 84%
Ducted, 5 tons and up	None	1 · index 63%
Non-ducted, up to 1.5 tons	6 · index 43%	8 · index 73%
Non-ducted, 2 tons	1 · index 34%	2 · index 82%
Non-ducted, 2.5–3 tons	3 · index 47%	7 · index 57%
Non-ducted, 3.5–4.5 tons	1 · index 44%	5 · index 54%
Non-ducted, 5 tons and up	None	1 · index 59%

Cold-climate and all-around picks, size class by size class

Each manufacturer’s best model on each board in every size and duct type, side by side; the higher score is in bold. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there), so the two compare fairly even when they make different sizes.

Cold-climate picks

Best cold-climate pick per size and duct type (keeps at least 70% of its heat at 5°F). Qualifies when its capacity retention at 5°F (capacity at 5°F as a share of capacity at 47°F) is at least 70% and Capacity retention at 5°F, COP at 5°F, HSPF2 are all rated. Score = the equal-weight mean of its peer percentiles on Capacity retention at 5°F, COP at 5°F, HSPF2 (share of the other models in its peer group it beats, 0–100), all from one certified pairing: in each duct type a model is sold in, its qualifying pairing of that type with the best score; equal scores (one decimal) go to the higher heating capacity at 5°F.
Size and duct type	OLMOCold-climate score, best model	SEA BREEZE+Cold-climate score, best model
Ducted, up to 1.5 tons	No models in this size class	82.3(50 is the typical model of its size class)HSZ18H525ZMOwith ducted air handler D18H525ZMI8 of 8 models qualify · AHRI 216014134
Ducted, 2 tons	No models in this size class	85.7(50 is the typical model of its size class)HSZ24H525ZMOwith ducted air handler D24H525ZMI3 of 3 models qualify · AHRI 216014138
Ducted, 2.5–3 tons	No models in this size class	82.5(50 is the typical model of its size class)HMZ36H525ZMO3 of 5 models qualify · AHRI 216014166
Ducted, 3.5–4.5 tons	No models in this size class	82.7(50 is the typical model of its size class)HMZ48H525ZMO3 of 3 models qualify · AHRI 216014169
Ducted, 5 tons and up	No models in this size class	None on this board (0 of 1 models qualify)
Non-ducted, up to 1.5 tons	69.5(50 is the typical model of its size class)OS-RMS18-230VO2 of 6 models qualify · AHRI 217739001	89.5(50 is the typical model of its size class) (higher)SZ09H525ZMOwith ductless indoor unit C09H525ZMI8 of 8 models qualify · AHRI 216014100
Non-ducted, 2 tons	38.8(50 is the typical model of its size class)OS-SR24-230VOwith ductless indoor unit OS-A24SRW-230VI1 of 1 models qualify · AHRI 218752476	89.4(50 is the typical model of its size class) (higher)HSZ24H525ZMOwith ductless indoor unit CA24H525ZMI2 of 2 models qualify · AHRI 216014136
Non-ducted, 2.5–3 tons	53.7(50 is the typical model of its size class)OS-RMS36-230VO2 of 3 models qualify · AHRI 217739004	89.4(50 is the typical model of its size class) (higher)CSZ36H525ZMOwith ductless indoor unit FC36H525ZMI5 of 7 models qualify · AHRI 216014140
Non-ducted, 3.5–4.5 tons	16.4(50 is the typical model of its size class)OS-RMS42-230VO1 of 1 models qualify · AHRI 217739003	73.4(50 is the typical model of its size class) (higher)HMZ48H525ZMO5 of 5 models qualify · AHRI 216014170
Non-ducted, 5 tons and up	No models in this size class	None on this board (0 of 1 models qualify)

All-around best

Best all-around model per size and duct type. Score = 50% heating, the mean of its peer percentiles on COP at 5°F, Capacity retention at 5°F, HSPF2, plus 50% cooling, the mean of its peer percentiles on SEER2 and EER2 (share of the other models in its peer group it beats, 0–100). All five ratings are required; there is no minimum heat kept at 5°F. In each duct type a model is sold in, it is scored on its pairing of that type with the best score; equal scores (one decimal) go to the higher cold-climate score, then the higher heating capacity at 5°F.
Size and duct type	OLMOAll-around score, best model	SEA BREEZE+All-around score, best model
Ducted, up to 1.5 tons	No models in this size class	86.5(50 is the typical model of its size class)HSZ09H525ZMOwith ducted air handler D09H525ZMI8 of 8 models have all five ratings · AHRI 216014123
Ducted, 2 tons	No models in this size class	78.8(50 is the typical model of its size class)SZ24H525ZMOwith ducted air handler D24H525ZMI3 of 3 models have all five ratings · AHRI 216014116
Ducted, 2.5–3 tons	No models in this size class	83.6(50 is the typical model of its size class)HMZ36H525ZMO5 of 5 models have all five ratings · AHRI 216014166
Ducted, 3.5–4.5 tons	No models in this size class	85.1(50 is the typical model of its size class)MZ48H525ZMO3 of 3 models have all five ratings · AHRI 216014154
Ducted, 5 tons and up	No models in this size class	62.5(50 is the typical model of its size class)MZ60H525ZMO1 of 1 models have all five ratings · AHRI 216014157
Non-ducted, up to 1.5 tons	69.2(50 is the typical model of its size class)OS-RMS18-230VO6 of 6 models have all five ratings · AHRI 217739001	92.6(50 is the typical model of its size class) (higher)SZ09H525ZMOwith ductless indoor unit C09H525ZMI8 of 8 models have all five ratings · AHRI 216014100
Non-ducted, 2 tons	34.1(50 is the typical model of its size class)OS-SR24-230VOwith ductless indoor unit OS-A24SRW-230VI1 of 1 models have all five ratings · AHRI 218752476	86.8(50 is the typical model of its size class) (higher)SZ24H525ZMOwith ductless indoor unit WM24H525ZMI2 of 2 models have all five ratings · AHRI 216014113
Non-ducted, 2.5–3 tons	64.2(50 is the typical model of its size class)OS-RMS27-230VO3 of 3 models have all five ratings · AHRI 217739002	78.3(50 is the typical model of its size class) (higher)HMZ36H525ZMO7 of 7 models have all five ratings · AHRI 216014165
Non-ducted, 3.5–4.5 tons	43.7(50 is the typical model of its size class)OS-RMS42-230VO1 of 1 models have all five ratings · AHRI 217739003	75.6(50 is the typical model of its size class) (higher)HMZ48H525ZMO5 of 5 models have all five ratings · AHRI 216014168
Non-ducted, 5 tons and up	No models in this size class	58.6(50 is the typical model of its size class)MZ60H525ZMO1 of 1 models have all five ratings · AHRI 216014156

All-around board, every manufacturer

Standout model on each rating

Each manufacturer’s model that beats the largest share of comparable models on the rating; the higher share is in bold.

Top model per rating by peer percentile, with its AHRI-certified value and peer group
Rating	OLMO	SEA BREEZE+
COP at 5°F	beats 100% · 2.53OS-SR18-230VONon-ducted, up to 1.5 tons	beats 99% · 2.51SZ12H525ZMONon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 87% · 100%OS-RMS18-230VONon-ducted, up to 1.5 tons	beats 98% · 126%HSZ09H525ZMONon-ducted, up to 1.5 tons
HSPF2	beats 64% · 10.0OS-RMS18-230VONon-ducted, up to 1.5 tons	beats 99% · 11.0HMZ48H525ZMODucted, 3.5–4.5 tons
SEER2	beats 75% · 23.0OS-RMS27-230VONon-ducted, 2.5–3 tons	beats 97% · 25.0MZ27H525ZMONon-ducted, 2.5–3 tons
EER2	beats 80% · 12.9OS-RMS27-230VONon-ducted, 2.5–3 tons	beats 97% · 16.2SZ09H525ZMONon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 93% · 18,000 Btu/hOS-RMS18-230VONon-ducted, up to 1.5 tons	beats 98% · 39,500 Btu/hCSZ36H525ZMONon-ducted, 2.5–3 tons

More comparisons

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OLMO vs SEA BREEZE+ heat pumps