Cowsar vs Kerr Kapstone heat pumps
Measured against models of the same size and duct type, Kerr Kapstone scores higher on 5 of the 6 ratings. Cowsar has 12 outdoor models, Kerr Kapstone has 12 outdoor models. Cowsar and Kerr Kapstone 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.
- Cowsar
- Kerr Kapstone
- Other ranked manufacturers
Source: AHRI Directory, NEEP · as of
| Rating | Cowsar | Kerr Kapstone |
|---|---|---|
| Efficiency index | 34%median — | 73%median — |
| COP at 5°F | 61% (higher)median 2.03 | 56% (higher)median 2.00 |
| Capacity retention at 5°F | 28%median 68% | 84%median 95% |
| HSPF2 | 25%median 9.0 | 85%median 10.3 |
| SEER2 | 36%median 19.8 | 77%median 21.7 |
| EER2 | 23%median 10.6 | 70%median 12.4 |
| Heating capacity at 5°F | 35%median 10,400 Btu/h | 82%median 20,800 Btu/h |
| Outdoor models | 12 | 12 |
| AHRI certifications | 12 | 26 |
Share of models meeting each standard
| Standard | Cowsar | Kerr Kapstone |
|---|---|---|
| CEE 2025 Tier 1 (Split ASHP) | 75%9 models | 91.7%11 models |
| CEE 2026 Tier 1 (Split ASHP) | 75%9 models | 91.7%11 models |
| CEE Advanced Tier (Split ASHP) | 0%0 models | 0%0 models |
| Xcel Energy Colorado cold-climate ASHP (2025) | 50%6 models | 100%12 models |
| DOE Cold Climate Heat Pump Challenge | 0%0 models | 0%0 models |
| ENERGY STAR Cold Climate | 0%0 models | 100%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.
- Cowsar
- Kerr Kapstone
- 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
| Size and duct type | Cowsar | Kerr Kapstone |
|---|---|---|
| Ducted, up to 1.5 tons | None | 2 · index 74% |
| Ducted, 2 tons | None | 2 · index 75% |
| Ducted, 2.5–3 tons | None | 2 · index 65% |
| Ducted, 3.5–4.5 tons | None | 2 · index 48% |
| Non-ducted, up to 1.5 tons | 9 · index 37% | 4 · index 92% |
| Non-ducted, 2 tons | 3 · index 24% | 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
| Size and duct type | CowsarCold-climate score, best model | Kerr KapstoneCold-climate score, best model |
|---|---|---|
| Ducted, up to 1.5 tons | No models in this size class | 75.1(50 is the typical model of its size class)A-KZP15SA-1with ducted air handler B-KZP15SA-12 of 2 models qualify · AHRI 218404574 |
| Ducted, 2 tons | No models in this size class | 80.5(50 is the typical model of its size class)A-KZP24SA-1with ducted air handler B-KZP24SA-12 of 2 models qualify · AHRI 218404575 |
| Ducted, 2.5–3 tons | No models in this size class | 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 tons | No models in this size class | 68.8(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 tons | 47.3(50 is the typical model of its size class)SE7203P-9Kwith ductless indoor unit SE7203S-9KAlso listed as SE7203P-9K-ASZ, SE7203PW-9K-ZAZ6 of 9 models qualify · AHRI 218787879 | 87.6(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 tons | None on this board (0 of 3 models qualify) | No models in this size class |
All-around best
| Size and duct type | CowsarAll-around score, best model | Kerr KapstoneAll-around score, best model |
|---|---|---|
| Ducted, up to 1.5 tons | No models in this size class | 83.9(50 is the typical model of its size class)A-KZP15SA-1with ducted air handler B-KZP15SA-12 of 2 models have all five ratings · AHRI 218404574 |
| Ducted, 2 tons | No models in this size class | 89.9(50 is the typical model of its size class)A-KZP24SA-1with ducted air handler B-KZP24SA-12 of 2 models have all five ratings · AHRI 218404575 |
| Ducted, 2.5–3 tons | No models in this size class | 67.3(50 is the typical model of its size class)A-KX12P36SA-1with ducted air handler B-KX12P36SA-12 of 2 models have all five ratings · AHRI 217478343 |
| Ducted, 3.5–4.5 tons | No models in this size class | 57.1(50 is the typical model of its size class)A-KX12P48SA-1with ducted air handler B-KX12P48SA-12 of 2 models have all five ratings · AHRI 217478344 |
| Non-ducted, up to 1.5 tons | 39.5(50 is the typical model of its size class)SE7203P-9Kwith ductless indoor unit SE7203S-9KAlso listed as SE7203P-9K-ASZ, SE7203PW-9K-ZAZ9 of 9 models have all five ratings · AHRI 218787879 | 93.4(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 tons | 23.5(50 is the typical model of its size class)SE7203P-24Kwith ductless indoor unit SE7203S-24KAlso listed as SE7203PW-24K-ZAZ, SE7203P-24K-ASZ3 of 3 models have all five ratings · AHRI 218787883 | No models in this size class |
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.
| Rating | Cowsar | Kerr Kapstone |
|---|---|---|
| COP at 5°F | beats 74% · 2.09SE7203S-18KAlso listed as SE7203SW-18K-ZAZ, SE7203S-18K-ASZNon-ducted, up to 1.5 tons | beats 94% · 2.34A-KZP18SA-1Non-ducted, up to 1.5 tons |
| Capacity retention at 5°F | beats 61% · 80%SE7203P-9KAlso listed as SE7203P-9K-ASZ, SE7203PW-9K-ZAZNon-ducted, up to 1.5 tons | beats 100% · 150%A-KZP06SA-1Non-ducted, up to 1.5 tons |
| HSPF2 | beats 29% · 9.0SE7203P-9KAlso listed as SE7203P-9K-ASZ, SE7203PW-9K-ZAZNon-ducted, up to 1.5 tons | beats 100% · 15.6A-KZP06SA-1Non-ducted, up to 1.5 tons |
| SEER2 | beats 56% · 22.0A7201P-12K-ELAlso listed as A7201PW-12K-EL, A7201PW-12K-ZAZNon-ducted, up to 1.5 tons | beats 100% · 27.0A-KZP15SA-1Ducted, up to 1.5 tons |
| EER2 | beats 28% · 11.0SE7203S-18KAlso listed as SE7203SW-18K-ZAZ, SE7203S-18K-ASZNon-ducted, up to 1.5 tons | beats 99% · 17.4A-KZP06SA-1Non-ducted, up to 1.5 tons |
| Heating capacity at 5°F | beats 73% · 12,600 Btu/hSE7203S-18KAlso listed as SE7203SW-18K-ZAZ, SE7203S-18K-ASZNon-ducted, up to 1.5 tons | beats 99% · 22,600 Btu/hA-KZP18SA-1Non-ducted, up to 1.5 tons |