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Stealth Comfort vs ZOKOP heat pumps

Measured against models of the same size and duct type, Stealth Comfort scores higher on 6 of the 6 ratings. Stealth Comfort has 17 outdoor models, ZOKOP has 17 outdoor models. Stealth Comfort and ZOKOP 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.
Stealth Comfort and ZOKOP 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, Stealth Comfort scores higher on 6 of the 6 ratings.
  • Stealth Comfort
  • ZOKOP
  • Other ranked manufacturers
Stealth …ZOKOP

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingStealth ComfortZOKOP
Efficiency index50% (higher)median —34% (higher)median —
COP at 5°F29% (higher)median 1.8122% (higher)median 1.80
Capacity retention at 5°F77% (higher)median 90%35% (higher)median 68%
HSPF249% (higher)median 8.818% (higher)median 8.5
SEER254% (higher)median 20.032% (higher)median 19.0
EER243% (higher)median 11.324% (higher)median 10.0
Heating capacity at 5°F72% (higher)median 24,000 Btu/h44% (higher)median 10,350 Btu/h
Outdoor models1717
AHRI certifications2917

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardStealth ComfortZOKOP
CEE 2025 Tier 1 (Split ASHP)82.4%14 models41.2%7 models
CEE 2026 Tier 1 (Split ASHP)82.4%14 models41.2%7 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)100%17 models29.4%5 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate29.4%5 models0%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 · 3 groups where both have models
  • Stealth Comfort
  • ZOKOP
  • 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 modelsNon-ducted, 2.5–3 tons1.85975 modelsNon-ducted, 3.5–4.5 tons1.97438 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 typeStealth ComfortZOKOP
Ducted, up to 1.5 tons1 · index 22%None
Ducted, 2 tons4 · index 48%None
Ducted, 2.5–3 tons2 · index 39%None
Ducted, 3.5–4.5 tons4 · index 54%None
Non-ducted, up to 1.5 tons5 · index 66%15 · index 35%
Non-ducted, 2 tons2 · index 63%1 · index —
Non-ducted, 2.5–3 tons3 · index 41%1 · index 28%
Non-ducted, 3.5–4.5 tons1 · index 19%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 typeStealth ComfortCold-climate score, best modelZOKOPCold-climate score, best model
Ducted, up to 1.5 tons35.2(50 is the typical model of its size class)SC-18Z-HH-M21 of 1 models qualify · AHRI 208674943No models in this size class
Ducted, 2 tons54.2(50 is the typical model of its size class)ACIQ-PHH1824000K000V3 of 3 models qualify · AHRI 215387230No models in this size class
Ducted, 2.5–3 tons55.3(50 is the typical model of its size class)SC-2436-HPwith ducted air handler SC-36-AH3 of 3 models qualify · AHRI 211717294No models in this size class
Ducted, 3.5–4.5 tons62.4(50 is the typical model of its size class)ACIQ-PHH1748000K000V4 of 4 models qualify · AHRI 215387232No models in this size class
Non-ducted, up to 1.5 tons80.1(50 is the typical model of its size class) (higher)SC-09ZPL-HP230with ductless indoor unit SC-09WPL-HP2305 of 5 models qualify · AHRI 20865075347.5(50 is the typical model of its size class)TSC-12HA2/I3XI23-Owith ductless indoor unit TSC-12HA2/I3XI23-I5 of 15 models qualify · AHRI 213927374
Non-ducted, 2 tons76.1(50 is the typical model of its size class)SC-27Z-HH-M4B2 of 2 models qualify · AHRI 215742360None on this board (0 of 1 models qualify)
Non-ducted, 2.5–3 tons44.1(50 is the typical model of its size class)SC-36ZGLD-HP230Bwith ductless indoor unit SC-36WGLD-HP230B3 of 3 models qualify · AHRI 211580585None on this board (0 of 1 models qualify)
Non-ducted, 3.5–4.5 tons31.6(50 is the typical model of its size class)SC-42Z-HH-M51 of 1 models qualify · AHRI 208674951No 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 typeStealth ComfortAll-around score, best modelZOKOPAll-around score, best model
Ducted, up to 1.5 tons22.0(50 is the typical model of its size class)SC-18Z-HH-M21 of 1 models have all five ratings · AHRI 208674943No models in this size class
Ducted, 2 tons60.8(50 is the typical model of its size class)SC-2436-HPwith ducted air handler SC-24-AH4 of 4 models have all five ratings · AHRI 211717293No models in this size class
Ducted, 2.5–3 tons54.6(50 is the typical model of its size class)ACIQ-PHH1836000K000V2 of 2 models have all five ratings · AHRI 215387231No models in this size class
Ducted, 3.5–4.5 tons66.7(50 is the typical model of its size class)ACIQ-PHH1748000K000V4 of 4 models have all five ratings · AHRI 215387232No models in this size class
Non-ducted, up to 1.5 tons88.7(50 is the typical model of its size class) (higher)SC-09ZPL-HP230with ductless indoor unit SC-09WPL-HP2305 of 5 models have all five ratings · AHRI 20865075360.2(50 is the typical model of its size class)TSC-12HA2/I3XI23-Owith ductless indoor unit TSC-12HA2/I3XI23-I9 of 15 models have all five ratings · AHRI 213927374
Non-ducted, 2 tons71.5(50 is the typical model of its size class)SC-27Z-HH-M4B2 of 2 models have all five ratings · AHRI 215742360None on this board (0 of 1 models have all five ratings)
Non-ducted, 2.5–3 tons47.8(50 is the typical model of its size class) (higher)SC-36ZGLD-HP230Bwith ductless indoor unit SC-36WGLD-HP230B3 of 3 models have all five ratings · AHRI 21158058528.1(50 is the typical model of its size class)TMSC-27HA2/I2XI19-O1 of 1 models have all five ratings · AHRI 213927380
Non-ducted, 3.5–4.5 tons18.7(50 is the typical model of its size class)SC-42Z-HH-M51 of 1 models have all five ratings · AHRI 208674951No 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
RatingStealth ComfortZOKOP
COP at 5°Fbeats 76% · 2.10SC-27Z-HH-M4BNon-ducted, 2 tonsbeats 22% · 1.80TSC-18HA2/I2XI19-ONon-ducted, up to 1.5 tons
Capacity retention at 5°Fbeats 99% · 144%SC-09ZPL-HP230Non-ducted, up to 1.5 tonsbeats 60% · 76%TSC-12HA2/I3XI23-ONon-ducted, up to 1.5 tons
HSPF2beats 88% · 11.0SC-09ZPL-HP230Non-ducted, up to 1.5 tonsbeats 57% · 9.5TSC-12HA2/I3XI23-ONon-ducted, up to 1.5 tons
SEER2beats 95% · 27.0SC-09ZPL-HP230Non-ducted, up to 1.5 tonsbeats 73% · 23.0TSC-09HA1/I3XI22-ONon-ducted, up to 1.5 tons
EER2beats 99% · 16.6SC-09ZPL-HP230Non-ducted, up to 1.5 tonsbeats 68% · 13.0TSC-12HA2/I3XI23-ONon-ducted, up to 1.5 tons
Heating capacity at 5°Fbeats 99% · 21,800 Btu/hSC-18Z-HH-M2Non-ducted, up to 1.5 tonsbeats 78% · 13,000 Btu/hTMSC-18HA2/I2XI20-ONon-ducted, up to 1.5 tons

More comparisons

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