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COMFORMATIC vs YISO heat pumps

Measured against models of the same size and duct type, YISO scores higher on 5 of the 6 ratings. COMFORMATIC has 4 outdoor models, YISO has 4 outdoor models. COMFORMATIC and YISO have no QMID on file and are not ranked.

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CompareData as of updated · 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.
COMFORMATIC and YISO 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, YISO scores higher on 5 of the 6 ratings.
  • COMFORMATIC
  • YISO
  • Other ranked manufacturers
COMFORMA…YISO

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingCOMFORMATICYISO
Efficiency index44%median —75%median —
COP at 5°F37%median 1.9060%median 2.03
Capacity retention at 5°F64%median 74%65%median 71%
HSPF242%median 9.379%median 9.4
SEER244%median 20.590%median 19.0
EER239%median 11.775%median 11.9
Heating capacity at 5°F64%median 11,200 Btu/h64%median 29,800 Btu/h
Outdoor models44
AHRI certifications874

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardCOMFORMATICYISO
CEE 2025 Tier 1 (Split ASHP)50%2 models100%4 models
CEE 2026 Tier 1 (Split ASHP)50%2 models100%4 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)50%2 models100%4 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate50%2 models100%4 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 · 1 groups where both have models
  • COMFORMATIC
  • YISO
  • All models of the group
Ducted, up to 1.5 tons2.00884 modelsDucted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsNon-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsmedian

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

Source: AHRI Directory · as of

Models per peer group · efficiency index within the group
Size and duct typeCOMFORMATICYISO
Ducted, up to 1.5 tons1 · index 32%None
Ducted, 2 tons1 · index 46%1 · index 84%
Ducted, 2.5–3 tonsNone1 · index 61%
Ducted, 3.5–4.5 tonsNone2 · index 78%
Non-ducted, up to 1.5 tons3 · index 39%None
Non-ducted, 2 tons1 · index 72%None

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 typeCOMFORMATICCold-climate score, best modelYISOCold-climate score, best model
Ducted, up to 1.5 tons36.0(50 is the typical model of its size class)GFMCX18-H21 of 1 models qualify · AHRI 212925600No models in this size class
Ducted, 2 tons50.1(50 is the typical model of its size class)GFMCX24-H21 of 1 models qualify · AHRI 21292560371.4(50 is the typical model of its size class) (higher)YOHA2-36AAwith ducted air handler YAHA1-24BA1 of 1 models qualify · AHRI 214290126
Ducted, 2.5–3 tonsNo models in this size class61.1(50 is the typical model of its size class)YOHA8-36Awith ducted air handler YAHA2-36AA1 of 1 models qualify · AHRI 215722678
Ducted, 3.5–4.5 tonsNo models in this size class78.6(50 is the typical model of its size class)YOHA2-60AAwith ducted air handler YAHA1-48BA2 of 2 models qualify · AHRI 214290128
Non-ducted, up to 1.5 tons73.4(50 is the typical model of its size class)GFMCX18-H23 of 3 models qualify · AHRI 212925599No models in this size class
Non-ducted, 2 tons76.1(50 is the typical model of its size class)GFMCX24-H21 of 1 models qualify · AHRI 212925602No models in this size class

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 typeCOMFORMATICAll-around score, best modelYISOAll-around score, best model
Ducted, up to 1.5 tons31.5(50 is the typical model of its size class)GFMCX18-H21 of 1 models have all five ratings · AHRI 212925600No models in this size class
Ducted, 2 tons45.9(50 is the typical model of its size class)GFMCX24-H21 of 1 models have all five ratings · AHRI 21292560384.1(50 is the typical model of its size class) (higher)YOHA2-36AAwith ducted air handler YAHA1-24BA2 of 2 models have all five ratings · AHRI 214290126
Ducted, 3.5–4.5 tonsNo models in this size class86.4(50 is the typical model of its size class)YOHA2-60AAwith ducted air handler YAHA1-48BA2 of 2 models have all five ratings · AHRI 214290128
Non-ducted, up to 1.5 tons58.1(50 is the typical model of its size class)GFMCX18-H23 of 3 models have all five ratings · AHRI 212925599No models in this size class
Non-ducted, 2 tons71.5(50 is the typical model of its size class)GFMCX24-H21 of 1 models have all five ratings · AHRI 212925602No models in this size class

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
RatingCOMFORMATICYISO
COP at 5°Fbeats 90% · 2.22GFMCX18-H2Non-ducted, up to 1.5 tonsbeats 75% · 2.10YOHA2-60AADucted, 3.5–4.5 tons
Capacity retention at 5°Fbeats 75% · 96%GFMCX24-H2Ducted, 2 tonsbeats 72% · 83%YOHA2-60AADucted, 2.5–3 tons
HSPF2beats 73% · 10.0GFMCX24-H2Non-ducted, 2 tonsbeats 92% · 9.5YOHA2-60AADucted, 3.5–4.5 tons
SEER2beats 66% · 21.0GFMCX24-H2Non-ducted, 2 tonsbeats 95% · 20.5YOHA2-36AADucted, 2 tons
EER2beats 62% · 12.5GFMCX24-H2Non-ducted, 2 tonsbeats 95% · 13.0YOHA2-36AADucted, 2 tons
Heating capacity at 5°Fbeats 84% · 13,800 Btu/hGFMCX18-H2Non-ducted, up to 1.5 tonsbeats 70% · 38,500 Btu/hYOHA2-60AADucted, 3.5–4.5 tons

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