airspool vs Legacy Systems heat pumps
Measured against models of the same size and duct type, airspool scores higher on 5 of the 6 ratings. airspool has 11 outdoor models, Legacy Systems has 11 outdoor models. airspool and Legacy Systems 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.
- airspool
- Legacy Systems
- Other ranked manufacturers
Source: AHRI Directory, NEEP · as of
| Rating | airspool | Legacy Systems |
|---|---|---|
| Efficiency index | 66% (higher)median — | 44% (higher)median — |
| COP at 5°F | 76% (higher)median 2.10 | 40% (higher)median 1.90 |
| Capacity retention at 5°F | 75% (higher)median 95% | 17% (higher)median 50% |
| HSPF2 | 72% (higher)median 10.0 | 32% (higher)median 7.8 |
| SEER2 | 58% (higher)median 21.5 | 31% (higher)median 15.0 |
| EER2 | 65%median 12.6 | 87%median 12.5 |
| Heating capacity at 5°F | 64% (higher)median 18,250 Btu/h | 23% (higher)median 14,400 Btu/h |
| Outdoor models | 11 | 11 |
| AHRI certifications | 11 | 799 |
Share of models meeting each standard
| Standard | airspool | Legacy Systems |
|---|---|---|
| CEE 2025 Tier 1 (Split ASHP) | 72.7%8 models | 0%0 models |
| CEE 2026 Tier 1 (Split ASHP) | 72.7%8 models | 0%0 models |
| CEE Advanced Tier (Split ASHP) | 0%0 models | 0%0 models |
| Xcel Energy Colorado cold-climate ASHP (2025) | 72.7%8 models | 0%0 models |
| DOE Cold Climate Heat Pump Challenge | 0%0 models | 0%0 models |
| ENERGY STAR Cold Climate | 72.7%8 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.
- airspool
- Legacy Systems
- 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 | airspool | Legacy Systems |
|---|---|---|
| Ducted, up to 1.5 tons | None | 2 · index 38% |
| Ducted, 2 tons | None | 2 · index 35% |
| Ducted, 2.5–3 tons | None | 4 · index 46% |
| Ducted, 3.5–4.5 tons | None | 3 · index 52% |
| Non-ducted, up to 1.5 tons | 6 · index 64% | None |
| Non-ducted, 2 tons | 4 · index 67% | None |
| Non-ducted, 2.5–3 tons | 1 · index 71% | 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 | airspoolCold-climate score, best model | Legacy SystemsCold-climate score, best model |
|---|---|---|
| Ducted, up to 1.5 tons | No models in this size class | None on this board (0 of 2 models qualify) |
| Ducted, 2 tons | No models in this size class | None on this board (0 of 2 models qualify) |
| Ducted, 2.5–3 tons | No models in this size class | None on this board (0 of 4 models qualify) |
| Ducted, 3.5–4.5 tons | No models in this size class | None on this board (0 of 3 models qualify) |
| Non-ducted, up to 1.5 tons | 82.4(50 is the typical model of its size class)DWLA4-ACDC1-12KR2(US)with ductless indoor unit DGLA4-ACDC1-12KR2(US)Also listed as DWLA4-12KR2(US)3 of 6 models qualify · AHRI 216770155 | No models in this size class |
| Non-ducted, 2 tons | 84.5(50 is the typical model of its size class)DWLC2-ACDC-24KR2(US)with ductless indoor unit DGLA3-ACDC-24KR2(US)Also listed as DWLC2-24KR2(US)4 of 4 models qualify · AHRI 216770156 | No models in this size class |
| Non-ducted, 2.5–3 tons | 71.7(50 is the typical model of its size class)DW4E1-ACDC-36KR2(US)1 of 1 models qualify · AHRI 217958908 | No models in this size class |
All-around best
| Size and duct type | airspoolAll-around score, best model | Legacy SystemsAll-around score, best model |
|---|---|---|
| Ducted, up to 1.5 tons | No models in this size class | 38.8(50 is the typical model of its size class)GLZS4MA1810A*with ducted air handler AMST24BU1300A2 of 2 models have all five ratings · AHRI 215233840 |
| Ducted, 2 tons | No models in this size class | 39.6(50 is the typical model of its size class)GLZS4MA2410A*with ducted air handler AMST24BU1300A2 of 2 models have all five ratings · AHRI 215233979 |
| Ducted, 2.5–3 tons | No models in this size class | 52.0(50 is the typical model of its size class)GLZS4MA3010A*with ducted air handler AWST30LU13**A4 of 4 models have all five ratings · AHRI 215234313 |
| Ducted, 3.5–4.5 tons | No models in this size class | 53.3(50 is the typical model of its size class)GLZS4BA6010A*with ducted air handler AMST60DU1300A3 of 3 models have all five ratings · AHRI 215233838 |
| Non-ducted, up to 1.5 tons | 70.7(50 is the typical model of its size class)DWLA4-ACDC1-12KR2(US)with ductless indoor unit DGLA4-ACDC1-12KR2(US)Also listed as DWLA4-12KR2(US)3 of 6 models have all five ratings · AHRI 216770155 | No models in this size class |
| Non-ducted, 2 tons | 72.1(50 is the typical model of its size class)DWLC2-ACDC-24KR2(US)with ductless indoor unit DGLA3-ACDC-24KR2(US)Also listed as DWLC2-24KR2(US)4 of 4 models have all five ratings · AHRI 216770156 | No models in this size class |
| Non-ducted, 2.5–3 tons | 70.6(50 is the typical model of its size class)DW4E1-ACDC-36KR2(US)1 of 1 models have all five ratings · AHRI 217958908 | 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 | airspool | Legacy Systems |
|---|---|---|
| COP at 5°F | beats 97% · 2.23DW4E1-ACDC-36KR2(US)Non-ducted, 2.5–3 tons | beats 56% · 2.00GLZS4BA3010A*Ducted, 2.5–3 tons |
| Capacity retention at 5°F | beats 100% · 116%DWLC2-ACDC-24KR2(US)Also listed as DWLC2-24KR2(US)Non-ducted, 2 tons | beats 23% · 53%GLZS4MA3010A*Ducted, 2.5–3 tons |
| HSPF2 | beats 87% · 11.0DWLC2-ACDC-24KR2(US)Also listed as DWLC2-24KR2(US)Non-ducted, 2 tons | beats 51% · 8.2GLZS4BA6010A*Ducted, 3.5–4.5 tons |
| SEER2 | beats 84% · 25.0DWA4-09KR2(US)Non-ducted, up to 1.5 tons | beats 35% · 15.2GLZS4BA4210A*Ducted, 3.5–4.5 tons |
| EER2 | beats 87% · 14.5DWA4-09KR2(US)Non-ducted, up to 1.5 tons | beats 93% · 12.5GLZS4BA4210A*Ducted, 3.5–4.5 tons |
| Heating capacity at 5°F | beats 81% · 22,000 Btu/hDWLC2-ACDC-24KR2(US)Also listed as DWLC2-24KR2(US)Non-ducted, 2 tons | beats 46% · 8,700 Btu/hGLZS4BA1810A*Ducted, up to 1.5 tons |