Bluefin vs MULTIZONE heat pumps

Measured against models of the same size and duct type, Bluefin scores higher on 6 of the 6 ratings. Bluefin has 9 outdoor models, MULTIZONE has 9 outdoor models. Bluefin and MULTIZONE have no QMID on file and are not ranked.

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CompareData as of Oct 11, 2026updated Oct 11, 2026 · sources

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.

Bluefin and MULTIZONE 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, Bluefin scores higher on 6 of the 6 ratings.

Bluefin
MULTIZONE
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Bluefin	MULTIZONE
Efficiency index	73% (higher)median —	47% (higher)median —
COP at 5°F	67% (higher)median 1.99	14% (higher)median 1.78
Capacity retention at 5°F	65% (higher)median 86%	33% (higher)median 68%
HSPF2	76% (higher)median 10.5	23% (higher)median 8.5
SEER2	78% (higher)median 23.1	31% (higher)median 18.5
EER2	77% (higher)median 13.0	47% (higher)median 10.9
Heating capacity at 5°F	57% (higher)median 11,300 Btu/h	51% (higher)median 10,150 Btu/h
Outdoor models	9	9
AHRI certifications	9	9

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Bluefin	MULTIZONE
CEE 2025 Tier 1 (Split ASHP)	100%9 models	22.2%2 models
CEE 2026 Tier 1 (Split ASHP)	100%9 models	22.2%2 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	100%9 models	11.1%1 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	88.9%8 models	0%0 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 · 2 groups where both have models

Bluefin
MULTIZONE
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	Bluefin	MULTIZONE
Non-ducted, up to 1.5 tons	7 · index 75%	6 · index 47%
Non-ducted, 2 tons	2 · index 69%	2 · index —
Non-ducted, 2.5–3 tons	None	1 · index —

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	BluefinCold-climate score, best model	MULTIZONECold-climate score, best model
Non-ducted, up to 1.5 tons	86.0(50 is the typical model of its size class) (higher)BFMS09PL-01Owith ductless indoor unit BFMS09PL-01I7 of 7 models qualify · AHRI 213769908	34.7(50 is the typical model of its size class)MIT12H2G31(O)with ductless indoor unit MIT12H2G31(I)1 of 6 models qualify · AHRI 9850218
Non-ducted, 2 tons	61.1(50 is the typical model of its size class)BFMS24PR-01Owith ductless indoor unit BFMS24PL-01I2 of 2 models qualify · AHRI 213769902	None on this board (0 of 2 models qualify)
Non-ducted, 2.5–3 tons	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	BluefinAll-around score, best model	MULTIZONEAll-around score, best model
Non-ducted, up to 1.5 tons	86.7(50 is the typical model of its size class) (higher)BFMS09PL-01Owith ductless indoor unit BFMS09PL-01I7 of 7 models have all five ratings · AHRI 213769908	46.8(50 is the typical model of its size class)MIT18H2G31(O)with ductless indoor unit MIT18H2G31(I)2 of 6 models have all five ratings · AHRI 9850219
Non-ducted, 2 tons	70.7(50 is the typical model of its size class)BFMS24PR-01Owith ductless indoor unit BFMS24PL-01I2 of 2 models have all five ratings · AHRI 213769902	None on this board (0 of 2 models have all five ratings)
Non-ducted, 2.5–3 tons	No models in this size class	None on this board (0 of 1 models have all five ratings)

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	Bluefin	MULTIZONE
COP at 5°F	beats 96% · 2.22BFMS24PL-01ONon-ducted, 2 tons	beats 22% · 1.80MIT18H2G31(O)Non-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 76% · 96%BFMS18PR-01ONon-ducted, up to 1.5 tons	beats 39% · 70%MIT12H2G31(O)Non-ducted, up to 1.5 tons
HSPF2	beats 94% · 11.6BFMS09PL-01ONon-ducted, up to 1.5 tons	beats 57% · 9.5MIT12H2G31(O)Non-ducted, up to 1.5 tons
SEER2	beats 92% · 26.4BFMS09PR-01ONon-ducted, up to 1.5 tons	beats 67% · 22.5MIT18H2G31(O)Non-ducted, up to 1.5 tons
EER2	beats 95% · 15.8BFMS09PR-01ONon-ducted, up to 1.5 tons	beats 80% · 13.7MIT09H2G31(O)Non-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 90% · 17,200 Btu/hBFMS18PR-01ONon-ducted, up to 1.5 tons	beats 66% · 11,900 Btu/hMIT18H2G31(O)Non-ducted, up to 1.5 tons

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