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 4 outdoor models, ZOKOP has 37 outdoor models. Stealth Comfort and ZOKOP 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.

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

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Stealth Comfort	ZOKOP
Efficiency index	76% (higher)median —	34% (higher)median —
COP at 5°F	58% (higher)median 2.00	34% (higher)median 1.80
Capacity retention at 5°F	93% (higher)median 100%	33% (higher)median 72%
HSPF2	87% (higher)median 10.0	46% (higher)median 9.5
SEER2	74% (higher)median 18.4	36% (higher)median 20.0
EER2	72% (higher)median 11.8	26% (higher)median 10.5
Heating capacity at 5°F	92% (higher)median 41,000 Btu/h	40% (higher)median 9,500 Btu/h
Outdoor models	4	37
AHRI certifications	4	37

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Stealth Comfort	ZOKOP
CEE 2025 Tier 1 (Split ASHP)	100%4 models	67.6%25 models
CEE 2026 Tier 1 (Split ASHP)	100%4 models	67.6%25 models
CEE Advanced Tier (Split ASHP)	25%1 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	100%4 models	56.8%21 models
DOE Cold Climate Heat Pump Challenge	25%1 models	0%0 models
ENERGY STAR Cold Climate	100%4 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 · 0 groups where both have models

Stealth Comfort
ZOKOP
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	Stealth Comfort	ZOKOP
Ducted, 2 tons	1 · index 73%	None
Ducted, 2.5–3 tons	1 · index 69%	None
Ducted, 3.5–4.5 tons	2 · index 81%	None
Non-ducted, up to 1.5 tons	None	27 · index 31%
Non-ducted, 2 tons	None	3 · index 35%
Non-ducted, 2.5–3 tons	None	6 · index 52%
Non-ducted, 3.5–4.5 tons	None	1 · index 27%

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	Stealth ComfortCold-climate score, best model	ZOKOPCold-climate score, best model
Ducted, 2 tons	76.2(50 is the typical model of its size class)ACIQ-24-HP32with ducted air handler ACIQ-24-AH321 of 1 models qualify · AHRI 215387246	No models in this size class
Ducted, 2.5–3 tons	76.9(50 is the typical model of its size class)ACIQ-36-HP32with ducted air handler ACIQ-36-AH321 of 1 models qualify · AHRI 215387247	No models in this size class
Ducted, 3.5–4.5 tons	85.1(50 is the typical model of its size class)ACIQ-60-HP32with ducted air handler ACIQ-60-AH322 of 2 models qualify · AHRI 215387249	No models in this size class
Non-ducted, up to 1.5 tons	No models in this size class	68.6(50 is the typical model of its size class)TMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-O14 of 27 models qualify · AHRI 216020699
Non-ducted, 2 tons	No models in this size class	None on this board (0 of 3 models qualify)
Non-ducted, 2.5–3 tons	No models in this size class	57.5(50 is the typical model of its size class)TMSC-27HA2/I2XI19B-OAlso listed as TMSC-27HA2/I2XI19B-O6 of 6 models qualify · AHRI 216020700
Non-ducted, 3.5–4.5 tons	No models in this size class	24.7(50 is the typical model of its size class)ZP42M2/19-O1 of 1 models qualify · AHRI 218035871

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	Stealth ComfortAll-around score, best model	ZOKOPAll-around score, best model
Ducted, 2 tons	73.1(50 is the typical model of its size class)ACIQ-24-HP32with ducted air handler ACIQ-24-AH321 of 1 models have all five ratings · AHRI 215387246	No models in this size class
Ducted, 2.5–3 tons	69.4(50 is the typical model of its size class)ACIQ-36-HP32with ducted air handler ACIQ-36-AH321 of 1 models have all five ratings · AHRI 215387247	No models in this size class
Ducted, 3.5–4.5 tons	83.1(50 is the typical model of its size class)ACIQ-48-HP32with ducted air handler ACIQ-48-AH322 of 2 models have all five ratings · AHRI 215387248	No models in this size class
Non-ducted, up to 1.5 tons	No models in this size class	72.2(50 is the typical model of its size class)TMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-O27 of 27 models have all five ratings · AHRI 216020699
Non-ducted, 2 tons	No models in this size class	39.1(50 is the typical model of its size class)TSC-24HA2/I2XI18B-Owith ductless indoor unit TSC-24HA2/I2XI18B-IAlso listed as TSC-24HA2/I2XI18B-O3 of 3 models have all five ratings · AHRI 216020695
Non-ducted, 2.5–3 tons	No models in this size class	65.1(50 is the typical model of its size class)TMSC-27HA2/I2XI19B-OAlso listed as TMSC-27HA2/I2XI19B-O6 of 6 models have all five ratings · AHRI 216020700
Non-ducted, 3.5–4.5 tons	No models in this size class	27.2(50 is the typical model of its size class)ZP42M2/19-O1 of 1 models have all five ratings · AHRI 218035871

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	Stealth Comfort	ZOKOP
COP at 5°F	beats 69% · 2.10ACIQ-60-HP32Ducted, 3.5–4.5 tons	beats 71% · 2.10TSC-24HA2/I2XI18B-OAlso listed as TSC-24HA2/I2XI18B-ONon-ducted, 2 tons
Capacity retention at 5°F	beats 94% · 100%ACIQ-48-HP32Ducted, 3.5–4.5 tons	beats 61% · 80%TMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-ONon-ducted, up to 1.5 tons
HSPF2	beats 90% · 10.5ACIQ-60-HP32Ducted, 3.5–4.5 tons	beats 80% · 10.5TMSC-27HA2/I2XI19B-OAlso listed as TMSC-27HA2/I2XI19B-ONon-ducted, 2.5–3 tons
SEER2	beats 85% · 19.0ACIQ-48-HP32Ducted, 3.5–4.5 tons	beats 91% · 24.0TMSC-27HA2/I2XI19B-OAlso listed as TMSC-27HA2/I2XI19B-ONon-ducted, 2.5–3 tons
EER2	beats 83% · 12.0ACIQ-48-HP32Ducted, 3.5–4.5 tons	beats 70% · 13.0TMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-ONon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 98% · 54,000 Btu/hACIQ-60-HP32Ducted, 3.5–4.5 tons	beats 88% · 16,000 Btu/hTMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-ONon-ducted, up to 1.5 tons

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