Legacy Systems vs ONE HOUR AIR CONDITIONING AND HEATING heat pumps
Measured against models of the same size and duct type, ONE HOUR AIR CONDITIONING AND HEATING scores higher on 3 of the 6 ratings. Legacy Systems has 46 outdoor models, ONE HOUR AIR CONDITIONING AND HEATING has 46 outdoor models. Legacy Systems and ONE HOUR AIR CONDITIONING AND HEATING 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.
- Legacy Systems
- ONE HOUR AIR CONDITIONING AND HEATING
- Other ranked manufacturers
Source: AHRI Directory, NEEP · as of
| Rating | Legacy Systems | ONE HOUR AIR CONDITIONING AND HEATING |
|---|---|---|
| Efficiency index | 39%median — | 39%median — |
| COP at 5°F | 39%median 1.90 | 40%median 1.92 |
| Capacity retention at 5°F | 13%median 46% | 13%median 46% |
| HSPF2 | 21%median 7.0 | 21%median 7.0 |
| SEER2 | 30%median 15.2 | 31%median 15.2 |
| EER2 | 66%median 11.4 | 67%median 11.4 |
| Heating capacity at 5°F | 12%median 14,800 Btu/h | 12%median 14,800 Btu/h |
| Outdoor models | 46 | 46 |
| AHRI certifications | 4,062 | 3,359 |
Share of models meeting each standard
| Standard | Legacy Systems | ONE HOUR AIR CONDITIONING AND HEATING |
|---|---|---|
| CEE 2025 Tier 1 (Split ASHP) | 6.5%3 models | 6.5%3 models |
| CEE 2026 Tier 1 (Split ASHP) | 2.2%1 models | 2.2%1 models |
| CEE Advanced Tier (Split ASHP) | 0%0 models | 0%0 models |
| Xcel Energy Colorado cold-climate ASHP (2025) | 0%0 models | 0%0 models |
| DOE Cold Climate Heat Pump Challenge | 0%0 models | 0%0 models |
| ENERGY STAR Cold Climate | 0%0 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.
- Legacy Systems
- ONE HOUR AIR CONDITIONING AND HEATING
- 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 | Legacy Systems | ONE HOUR AIR CONDITIONING AND HEATING |
|---|---|---|
| Ducted, up to 1.5 tons | 3 · index 35% | 3 · index 39% |
| Ducted, 2 tons | 8 · index 37% | 8 · index 37% |
| Ducted, 2.5–3 tons | 15 · index 38% | 15 · index 39% |
| Ducted, 3.5–4.5 tons | 18 · index 42% | 18 · index 42% |
| Ducted, 5 tons and up | 2 · index 36% | 2 · index 36% |
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 | Legacy SystemsCold-climate score, best model | ONE HOUR AIR CONDITIONING AND HEATINGCold-climate score, best model |
|---|---|---|
| Ducted, up to 1.5 tons | None on this board (0 of 3 models qualify) | None on this board (0 of 3 models qualify) |
| Ducted, 2 tons | None on this board (0 of 8 models qualify) | None on this board (0 of 8 models qualify) |
| Ducted, 2.5–3 tons | None on this board (0 of 15 models qualify) | None on this board (0 of 15 models qualify) |
| Ducted, 3.5–4.5 tons | None on this board (0 of 18 models qualify) | None on this board (0 of 18 models qualify) |
| Ducted, 5 tons and up | None on this board (0 of 2 models qualify) | None on this board (0 of 2 models qualify) |
All-around best
| Size and duct type | Legacy SystemsAll-around score, best model | ONE HOUR AIR CONDITIONING AND HEATINGAll-around score, best model |
|---|---|---|
| Ducted, up to 1.5 tons | 40.0(50 is the typical model of its size class)GSZB401810A*with ducted air handler CAPTA3626*4A*+MBVC1201**-1AAlso listed as GSZM401810A3 of 3 models have all five ratings · AHRI 215234904 | 40.0(50 is the typical model of its size class)GSZB401810A*with ducted air handler CAPTA3626*4A*+MBVC1201**-1AAlso listed as GSZM401810A3 of 3 models have all five ratings · AHRI 212836193 |
| Ducted, 2 tons | 59.1(50 is the typical model of its size class)GSZC702410A*with ducted air handler AMVT30BP1400A6 of 8 models have all five ratings · AHRI 215236246 | 59.1(50 is the typical model of its size class)GSZC702410A*with ducted air handler AMVT30BP1400A6 of 8 models have all five ratings · AHRI 211950327 |
| Ducted, 2.5–3 tons | 64.2(50 is the typical model of its size class)GSZC703610A*with ducted air handler CAPTA4230*4A*+MBVC2001**-1A11 of 15 models have all five ratings · AHRI 215236306 | 64.2(50 is the typical model of its size class)GSZC703610A*with ducted air handler CAPTA4230*4A*+MBVC2001**-1A11 of 15 models have all five ratings · AHRI 211950426 |
| Ducted, 3.5–4.5 tons | 68.2(50 is the typical model of its size class)GSZC704810A*with ducted air handler CAPT4961*4A*+MBVC2001**-1A11 of 18 models have all five ratings · AHRI 215236378 | 68.2(50 is the typical model of its size class)GSZC704810A*with ducted air handler CAPT4961*4A*+MBVC2001**-1A10 of 18 models have all five ratings · AHRI 211950547 |
| Ducted, 5 tons and up | 51.5(50 is the typical model of its size class)GPHH56041A*2 of 2 models have all five ratings · AHRI 215233043 | 51.5(50 is the typical model of its size class)GPHH56041A*2 of 2 models have all five ratings · AHRI 211948682 |
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 | Legacy Systems | ONE HOUR AIR CONDITIONING AND HEATING |
|---|---|---|
| COP at 5°F | beats 94% · 2.51GPHH56041A*Ducted, 5 tons and up | beats 94% · 2.51GPHH56041A*Ducted, 5 tons and up |
| Capacity retention at 5°F | beats 28% · 42%GPHH56041A*Ducted, 5 tons and up | beats 28% · 42%GPHH56041A*Ducted, 5 tons and up |
| HSPF2 | beats 55% · 8.2GSZC704810A*Ducted, 3.5–4.5 tons | beats 55% · 8.2GSZC704810A*Ducted, 3.5–4.5 tons |
| SEER2 | beats 81% · 17.2GSZC704810A*Ducted, 3.5–4.5 tons | beats 81% · 17.2GSZC704810A*Ducted, 3.5–4.5 tons |
| EER2 | beats 92% · 12.5GSZB404810A*Ducted, 3.5–4.5 tons | beats 92% · 12.5GSZB404810A*Ducted, 3.5–4.5 tons |
| Heating capacity at 5°F | beats 38% · 30,000 Btu/hGSZC706010A*Ducted, 3.5–4.5 tons | beats 24% · 23,000 Btu/hGPHH56041A*Ducted, 5 tons and up |