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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 6 of the 6 ratings. Legacy Systems has 11 outdoor models, ONE HOUR AIR CONDITIONING AND HEATING has 6 outdoor models. Legacy Systems and ONE HOUR AIR CONDITIONING AND HEATING 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.
Legacy Systems and ONE HOUR AIR CONDITIONING AND HEATING 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, ONE HOUR AIR CONDITIONING AND HEATING scores higher on 6 of the 6 ratings.
  • Legacy Systems
  • ONE HOUR AIR CONDITIONING AND HEATING
  • Other ranked manufacturers
Legacy S…ONE HOUR…

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingLegacy SystemsONE HOUR AIR CONDITIONING AND HEATING
Efficiency index44%median —58%median —
COP at 5°F40%median 1.9052%median 2.00
Capacity retention at 5°F17%median 50%29%median 50%
HSPF232%median 7.855%median 8.2
SEER231%median 15.051%median 15.6
EER287%median 12.591%median 12.5
Heating capacity at 5°F23%median 14,400 Btu/h31%median 26,300 Btu/h
Outdoor models116
AHRI certifications79915

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardLegacy SystemsONE HOUR AIR CONDITIONING AND HEATING
CEE 2025 Tier 1 (Split ASHP)0%0 models50%3 models
CEE 2026 Tier 1 (Split ASHP)0%0 models50%3 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)0%0 models0%0 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate0%0 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 · 1 groups where both have models
  • Legacy Systems
  • ONE HOUR AIR CONDITIONING AND HEATING
  • All models of the group
Ducted, up to 1.5 tons1.901,783 modelsDucted, 2 tons2.001,090 modelsDucted, 2.5–3 tons2.001,909 modelsDucted, 3.5–4.5 tons2.002,224 modelsDucted, 5 tons and up2.00321 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 typeLegacy SystemsONE HOUR AIR CONDITIONING AND HEATING
Ducted, up to 1.5 tons2 · index 38%None
Ducted, 2 tons2 · index 35%None
Ducted, 2.5–3 tons4 · index 46%None
Ducted, 3.5–4.5 tons3 · index 52%4 · index 56%
Ducted, 5 tons and upNone2 · index 63%

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 typeLegacy SystemsCold-climate score, best modelONE HOUR AIR CONDITIONING AND HEATINGCold-climate score, best model
Ducted, up to 1.5 tonsNone on this board (0 of 2 models qualify)No models in this size class
Ducted, 2 tonsNone on this board (0 of 2 models qualify)No models in this size class
Ducted, 2.5–3 tonsNone on this board (0 of 4 models qualify)No models in this size class
Ducted, 3.5–4.5 tonsNone on this board (0 of 3 models qualify)None on this board (0 of 4 models qualify)
Ducted, 5 tons and upNo models in this size classNone on this board (0 of 2 models qualify)

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 typeLegacy SystemsAll-around score, best modelONE HOUR AIR CONDITIONING AND HEATINGAll-around score, best model
Ducted, up to 1.5 tons38.8(50 is the typical model of its size class)GLZS4MA1810A*with ducted air handler AMST24BU1300A2 of 2 models have all five ratings · AHRI 215233840No models in this size class
Ducted, 2 tons39.6(50 is the typical model of its size class)GLZS4MA2410A*with ducted air handler AMST24BU1300A2 of 2 models have all five ratings · AHRI 215233979No models in this size class
Ducted, 2.5–3 tons52.0(50 is the typical model of its size class)GLZS4MA3010A*with ducted air handler AWST30LU13**A4 of 4 models have all five ratings · AHRI 215234313No models in this size class
Ducted, 3.5–4.5 tons53.3(50 is the typical model of its size class)GLZS4BA6010A*with ducted air handler AMST60DU1300A3 of 3 models have all five ratings · AHRI 21523383863.9(50 is the typical model of its size class) (higher)GLZT7CA4810A*with ducted air handler AMVT60DP1300A4 of 4 models have all five ratings · AHRI 216369319
Ducted, 5 tons and upNo models in this size class63.0(50 is the typical model of its size class)GLZS5BA6010A*with ducted air handler AMST60DU1300A2 of 2 models have all five ratings · AHRI 216369283

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
RatingLegacy SystemsONE HOUR AIR CONDITIONING AND HEATING
COP at 5°Fbeats 56% · 2.00GLZS4BA3010A*Ducted, 2.5–3 tonsbeats 54% · 2.00GLZS4BA6010A*Ducted, 3.5–4.5 tons
Capacity retention at 5°Fbeats 23% · 53%GLZS4MA3010A*Ducted, 2.5–3 tonsbeats 50% · 53%GLZT7CA6010A*Ducted, 5 tons and up
HSPF2beats 51% · 8.2GLZS4BA6010A*Ducted, 3.5–4.5 tonsbeats 66% · 8.2GLZS5BA6010A*Ducted, 5 tons and up
SEER2beats 35% · 15.2GLZS4BA4210A*Ducted, 3.5–4.5 tonsbeats 67% · 17.2GLZT7CA4810A*Ducted, 3.5–4.5 tons
EER2beats 93% · 12.5GLZS4BA4210A*Ducted, 3.5–4.5 tonsbeats 93% · 12.5GLZS4BA6010A*Ducted, 3.5–4.5 tons
Heating capacity at 5°Fbeats 46% · 8,700 Btu/hGLZS4BA1810A*Ducted, up to 1.5 tonsbeats 54% · 31,000 Btu/hGLZT7CA6010A*Ducted, 5 tons and up

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