Skip to content
Rebate.Blue

Fuji vs Kerr Kapstone heat pumps

Measured against models of the same size and duct type, Kerr Kapstone scores higher on 6 of the 6 ratings. Fuji has 12 outdoor models, Kerr Kapstone has 12 outdoor models. Fuji and Kerr Kapstone have no QMID on file and are not ranked.

New to heat pump ratings? The Simple view explains them in plain words →

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.
Fuji and Kerr Kapstone 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, Kerr Kapstone scores higher on 6 of the 6 ratings.
  • Fuji
  • Kerr Kapstone
  • Other ranked manufacturers
FujiKerr Kap…

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingFujiKerr Kapstone
Efficiency index52%median —73%median —
COP at 5°F54%median 2.0056%median 2.00
Capacity retention at 5°F57%median 78%84%median 95%
HSPF255%median 9.085%median 10.3
SEER259%median 19.077%median 21.7
EER237%median 10.970%median 12.4
Heating capacity at 5°F60%median 24,200 Btu/h82%median 20,800 Btu/h
Outdoor models1212
AHRI certifications1226

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardFujiKerr Kapstone
CEE 2025 Tier 1 (Split ASHP)75%9 models91.7%11 models
CEE 2026 Tier 1 (Split ASHP)75%9 models91.7%11 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)66.7%8 models100%12 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate0%0 models100%12 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 · 5 groups where both have models
  • Fuji
  • Kerr Kapstone
  • All models of the group
Ducted, up to 1.5 tons1.901,783 modelsDucted, 2 tons2.001,090 modelsDucted, 2.5–3 tons2.001,909 modelsDucted, 3.5–4.5 tons2.002,224 modelsNon-ducted, up to 1.5 tons1.953,455 modelsNon-ducted, 2 tons2.00863 modelsNon-ducted, 2.5–3 tons2.001,106 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 typeFujiKerr Kapstone
Ducted, up to 1.5 tons1 · index 47%2 · index 74%
Ducted, 2 tons1 · index 38%2 · index 75%
Ducted, 2.5–3 tons2 · index 43%2 · index 65%
Ducted, 3.5–4.5 tons2 · index 51%2 · index 48%
Non-ducted, up to 1.5 tons1 · index 60%4 · index 92%
Non-ducted, 2 tons1 · index 72%None
Non-ducted, 2.5–3 tons4 · index 54%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 typeFujiCold-climate score, best modelKerr KapstoneCold-climate score, best model
Ducted, up to 1.5 tons49.5(50 is the typical model of its size class)FAH18HP230Uwith ducted air handler FAH18HP230N1 of 1 models qualify · AHRI 21867983675.1(50 is the typical model of its size class) (higher)A-KZP15SA-1with ducted air handler B-KZP15SA-12 of 2 models qualify · AHRI 218404574
Ducted, 2 tons46.6(50 is the typical model of its size class)FAH24HP230Uwith ducted air handler FAH24HP230N1 of 1 models qualify · AHRI 21867983780.5(50 is the typical model of its size class) (higher)A-KZP24SA-1with ducted air handler B-KZP24SA-12 of 2 models qualify · AHRI 218404575
Ducted, 2.5–3 tonsNone on this board (0 of 2 models qualify)73.1(50 is the typical model of its size class)A-KX12P36SA-1with ducted air handler B-KX12P36SA-12 of 2 models qualify · AHRI 217478343
Ducted, 3.5–4.5 tons72.3(50 is the typical model of its size class) (higher)FAH48HP230Uwith ducted air handler FAH48HP230N2 of 2 models qualify · AHRI 21867984068.8(50 is the typical model of its size class)A-KX12P48SA-1with ducted air handler B-KX12P48SA-12 of 2 models qualify · AHRI 217478344
Non-ducted, up to 1.5 tons64.6(50 is the typical model of its size class)FM2H18D230U1 of 1 models qualify · AHRI 21866853687.6(50 is the typical model of its size class) (higher)A-KZP06SA-1with ductless indoor unit B-KZP06SA-13 of 4 models qualify · AHRI 217478336
Non-ducted, 2 tons67.5(50 is the typical model of its size class)FM3H24D230U1 of 1 models qualify · AHRI 218668537No models in this size class
Non-ducted, 2.5–3 tons59.0(50 is the typical model of its size class)FM4H42D230U4 of 4 models qualify · AHRI 218668540No 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 typeFujiAll-around score, best modelKerr KapstoneAll-around score, best model
Ducted, up to 1.5 tons47.2(50 is the typical model of its size class)FAH18HP230Uwith ducted air handler FAH18HP230N1 of 1 models have all five ratings · AHRI 21867983683.9(50 is the typical model of its size class) (higher)A-KZP15SA-1with ducted air handler B-KZP15SA-12 of 2 models have all five ratings · AHRI 218404574
Ducted, 2 tons37.6(50 is the typical model of its size class)FAH24HP230Uwith ducted air handler FAH24HP230N1 of 1 models have all five ratings · AHRI 21867983789.9(50 is the typical model of its size class) (higher)A-KZP24SA-1with ducted air handler B-KZP24SA-12 of 2 models have all five ratings · AHRI 218404575
Ducted, 2.5–3 tons43.0(50 is the typical model of its size class)FAH30HP230Uwith ducted air handler FAH30HP230N2 of 2 models have all five ratings · AHRI 21867983867.3(50 is the typical model of its size class) (higher)A-KX12P36SA-1with ducted air handler B-KX12P36SA-12 of 2 models have all five ratings · AHRI 217478343
Ducted, 3.5–4.5 tons53.2(50 is the typical model of its size class)FAH48HP230Uwith ducted air handler FAH48HP230N2 of 2 models have all five ratings · AHRI 21867984057.1(50 is the typical model of its size class) (higher)A-KX12P48SA-1with ducted air handler B-KX12P48SA-12 of 2 models have all five ratings · AHRI 217478344
Non-ducted, up to 1.5 tons59.8(50 is the typical model of its size class)FM2H18D230U1 of 1 models have all five ratings · AHRI 21866853693.4(50 is the typical model of its size class) (higher)A-KZP06SA-1with ductless indoor unit B-KZP06SA-13 of 4 models have all five ratings · AHRI 217478336
Non-ducted, 2 tons71.8(50 is the typical model of its size class)FM3H24D230U1 of 1 models have all five ratings · AHRI 218668537No models in this size class
Non-ducted, 2.5–3 tons66.6(50 is the typical model of its size class)FM4H30D230U4 of 4 models have all five ratings · AHRI 218668538No 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
RatingFujiKerr Kapstone
COP at 5°Fbeats 69% · 2.10FAH48HP230UDucted, 3.5–4.5 tonsbeats 94% · 2.34A-KZP18SA-1Non-ducted, up to 1.5 tons
Capacity retention at 5°Fbeats 79% · 90%FM3H24D230UNon-ducted, 2 tonsbeats 100% · 150%A-KZP06SA-1Non-ducted, up to 1.5 tons
HSPF2beats 69% · 9.0FAH48HP230UDucted, 3.5–4.5 tonsbeats 100% · 15.6A-KZP06SA-1Non-ducted, up to 1.5 tons
SEER2beats 79% · 23.0FM3H24D230UNon-ducted, 2 tonsbeats 100% · 27.0A-KZP15SA-1Ducted, up to 1.5 tons
EER2beats 75% · 12.5FM4H30D230UNon-ducted, 2.5–3 tonsbeats 99% · 17.4A-KZP06SA-1Non-ducted, up to 1.5 tons
Heating capacity at 5°Fbeats 85% · 14,500 Btu/hFM2H18D230UNon-ducted, up to 1.5 tonsbeats 99% · 22,600 Btu/hA-KZP18SA-1Non-ducted, up to 1.5 tons

More comparisons

Pick any two manufacturers