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ENERGI AIR vs Legacy Systems heat pumps

Measured against models of the same size and duct type, ENERGI AIR scores higher on 3 of the 6 ratings. ENERGI AIR has 46 outdoor models, Legacy Systems has 46 outdoor models. ENERGI AIR 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.
ENERGI AIR and Legacy Systems 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, ENERGI AIR scores higher on 3 of the 6 ratings.
  • ENERGI AIR
  • Legacy Systems
  • Other ranked manufacturers
ENERGI A…Legacy S…

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingENERGI AIRLegacy Systems
Efficiency index39%median —39%median —
COP at 5°F40% (higher)median 1.9239% (higher)median 1.90
Capacity retention at 5°F13%median 46%13%median 46%
HSPF221%median 7.021%median 7.0
SEER231% (higher)median 15.230% (higher)median 15.2
EER267% (higher)median 11.466% (higher)median 11.4
Heating capacity at 5°F12%median 14,800 Btu/h12%median 14,800 Btu/h
Outdoor models4646
AHRI certifications3,3674,062

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardENERGI AIRLegacy Systems
CEE 2025 Tier 1 (Split ASHP)6.5%3 models6.5%3 models
CEE 2026 Tier 1 (Split ASHP)2.2%1 models2.2%1 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 · 5 groups where both have models
  • ENERGI AIR
  • Legacy Systems
  • All models of the group
Ducted, up to 1.5 tons2.00884 modelsDucted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsDucted, 5 tons and up1.90239 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 typeENERGI AIRLegacy Systems
Ducted, up to 1.5 tons3 · index 39%3 · index 35%
Ducted, 2 tons8 · index 37%8 · index 37%
Ducted, 2.5–3 tons15 · index 39%15 · index 38%
Ducted, 3.5–4.5 tons18 · index 42%18 · index 42%
Ducted, 5 tons and up2 · 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

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 typeENERGI AIRCold-climate score, best modelLegacy SystemsCold-climate score, best model
Ducted, up to 1.5 tonsNone on this board (0 of 3 models qualify)None on this board (0 of 3 models qualify)
Ducted, 2 tonsNone on this board (0 of 8 models qualify)None on this board (0 of 8 models qualify)
Ducted, 2.5–3 tonsNone on this board (0 of 15 models qualify)None on this board (0 of 15 models qualify)
Ducted, 3.5–4.5 tonsNone on this board (0 of 18 models qualify)None on this board (0 of 18 models qualify)
Ducted, 5 tons and upNone on this board (0 of 2 models qualify)None 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 typeENERGI AIRAll-around score, best modelLegacy SystemsAll-around score, best model
Ducted, up to 1.5 tons40.0(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 21283612740.0(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
Ducted, 2 tons59.1(50 is the typical model of its size class)GSZC702410A*with ducted air handler AMVT30BP1400A6 of 8 models have all five ratings · AHRI 21194212159.1(50 is the typical model of its size class)GSZC702410A*with ducted air handler AMVT30BP1400A6 of 8 models have all five ratings · AHRI 215236246
Ducted, 2.5–3 tons64.2(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 21194215164.2(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
Ducted, 3.5–4.5 tons68.2(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 21194218968.2(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
Ducted, 5 tons and up51.5(50 is the typical model of its size class)GPHH56041A*2 of 2 models have all five ratings · AHRI 21194159351.5(50 is the typical model of its size class)GPHH56041A*2 of 2 models have all five ratings · AHRI 215233043

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
RatingENERGI AIRLegacy Systems
COP at 5°Fbeats 94% · 2.51GPHH56041A*Ducted, 5 tons and upbeats 94% · 2.51GPHH56041A*Ducted, 5 tons and up
Capacity retention at 5°Fbeats 28% · 42%GPHH56041A*Ducted, 5 tons and upbeats 28% · 42%GPHH56041A*Ducted, 5 tons and up
HSPF2beats 55% · 8.2GSZC704810A*Ducted, 3.5–4.5 tonsbeats 55% · 8.2GSZC704810A*Ducted, 3.5–4.5 tons
SEER2beats 81% · 17.2GSZC704810A*Ducted, 3.5–4.5 tonsbeats 81% · 17.2GSZC704810A*Ducted, 3.5–4.5 tons
EER2beats 92% · 12.5GSZB404810A*Ducted, 3.5–4.5 tonsbeats 92% · 12.5GSZB404810A*Ducted, 3.5–4.5 tons
Heating capacity at 5°Fbeats 24% · 23,000 Btu/hGPHH56041A*Ducted, 5 tons and upbeats 38% · 30,000 Btu/hGSZC706010A*Ducted, 3.5–4.5 tons

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