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BreezeAero vs LITHZEN heat pumps

Measured against models of the same size and duct type, BreezeAero scores higher on 3 of the 6 ratings. BreezeAero has 6 outdoor models, LITHZEN has 6 outdoor models. BreezeAero and LITHZEN 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.
BreezeAero and LITHZEN 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, BreezeAero scores higher on 3 of the 6 ratings.
  • BreezeAero
  • LITHZEN
  • Other ranked manufacturers
BreezeAe…LITHZEN

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingBreezeAeroLITHZEN
Efficiency index38%median ——median —
COP at 5°F32%median 1.80—median —
Capacity retention at 5°F42%median 74%—median —
HSPF254% (higher)median 9.83% (higher)median 8.0
SEER241% (higher)median 20.010% (higher)median 17.0
EER224% (higher)median 10.813% (higher)median 9.7
Heating capacity at 5°F44%median 13,000 Btu/h—median —
Outdoor models66
AHRI certifications66

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardBreezeAeroLITHZEN
CEE 2025 Tier 1 (Split ASHP)66.7%4 models0%0 models
CEE 2026 Tier 1 (Split ASHP)66.7%4 models0%0 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)66.7%4 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 · 2 groups where both have models
  • BreezeAero
  • LITHZEN
  • All models of the group
Non-ducted, up to 1.5 tons1.953,455 modelsNon-ducted, 2 tons2.00863 modelsNon-ducted, 2.5–3 tons2.001,106 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 typeBreezeAeroLITHZEN
Non-ducted, up to 1.5 tons4 · index 40%5 · index —
Non-ducted, 2 tons1 · index 27%1 · index —
Non-ducted, 2.5–3 tons1 · index 39%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

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 typeBreezeAeroCold-climate score, best modelLITHZENCold-climate score, best model
Non-ducted, up to 1.5 tons62.1(50 is the typical model of its size class)ACA-2535B3 of 4 models qualify · AHRI 218361441None on this board (0 of 5 models qualify)
Non-ducted, 2 tonsNone on this board (0 of 1 models qualify)None on this board (0 of 1 models qualify)
Non-ducted, 2.5–3 tons47.6(50 is the typical model of its size class)ACA-2537B1 of 1 models qualify · AHRI 218361442No models in this size class

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 typeBreezeAeroAll-around score, best modelLITHZENAll-around score, best model
Non-ducted, up to 1.5 tons62.2(50 is the typical model of its size class)ACA-2535B4 of 4 models have all five ratings · AHRI 218361441None on this board (0 of 5 models have all five ratings)
Non-ducted, 2 tons27.4(50 is the typical model of its size class)ACA-2520Bwith ductless indoor unit ACA-2519B1 of 1 models have all five ratings · AHRI 218361440None on this board (0 of 1 models have all five ratings)
Non-ducted, 2.5–3 tons38.7(50 is the typical model of its size class)ACA-2537B1 of 1 models have all five ratings · AHRI 218361442No models in this size class

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
RatingBreezeAeroLITHZEN
COP at 5°Fbeats 63% · 2.00ACA-2535BNon-ducted, up to 1.5 tons—
Capacity retention at 5°Fbeats 61% · 80%ACA-2514BNon-ducted, up to 1.5 tons—
HSPF2beats 64% · 10.0ACA-2516BNon-ducted, up to 1.5 tonsbeats 4% · 8.2FP11302US-12WHNon-ducted, up to 1.5 tons
SEER2beats 84% · 25.0ACA-2535BNon-ducted, up to 1.5 tonsbeats 15% · 18.1FP11302US-12WHNon-ducted, up to 1.5 tons
EER2beats 44% · 12.0ACA-2514BNon-ducted, up to 1.5 tonsbeats 25% · 10.8FP11303US-12WHNon-ducted, up to 1.5 tons
Heating capacity at 5°Fbeats 83% · 14,000 Btu/hACA-2535BNon-ducted, up to 1.5 tons—

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