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First Co. vs MITS AIR heat pumps

Measured against models of the same size and duct type, MITS AIR scores higher on 6 of the 6 ratings. First Co. has 21 outdoor models, MITS AIR has 6 outdoor models. First Co. and MITS AIR 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.
First Co. and MITS AIR 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, MITS AIR scores higher on 6 of the 6 ratings.
  • First Co.
  • MITS AIR
  • Other ranked manufacturers
First Co.MITS AIR

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingFirst Co.MITS AIR
Efficiency index11%median —58%median —
COP at 5°F34%median 1.9042%median 1.90
Capacity retention at 5°F12%median 49%80%median 93%
HSPF21%median 6.376%median 9.8
SEER20%median 11.955%median 16.7
EER212%median 10.047%median 11.7
Heating capacity at 5°F14%median 8,000 Btu/h84%median 35,800 Btu/h
Outdoor models216
AHRI certifications6120

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardFirst Co.MITS AIR
CEE 2025 Tier 1 (Split ASHP)0%0 models100%6 models
CEE 2026 Tier 1 (Split ASHP)0%0 models100%6 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)0%0 models100%6 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate0%0 models100%6 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 · 3 groups where both have models
  • First Co.
  • MITS AIR
  • 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 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 typeFirst Co.MITS AIR
Ducted, up to 1.5 tons11 · index 9%1 · index 63%
Ducted, 2 tons7 · index 13%1 · index 61%
Ducted, 2.5–3 tons3 · index 15%2 · index 65%
Ducted, 3.5–4.5 tonsNone2 · index 48%

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 typeFirst Co.Cold-climate score, best modelMITS AIRCold-climate score, best model
Ducted, up to 1.5 tonsNone on this board (0 of 11 models qualify)72.8(50 is the typical model of its size class)MAMOX430-18HFN10-M3Xwith ducted air handler MAMVBM-24A18T3N101 of 1 models qualify · AHRI 216621516
Ducted, 2 tonsNone on this board (0 of 7 models qualify)66.3(50 is the typical model of its size class)MAMOX430-24HFN10-M3Xwith ducted air handler MAMVBC-24HWFN10-MB3E-D1 of 1 models qualify · AHRI 216621511
Ducted, 2.5–3 tonsNone on this board (0 of 3 models qualify)73.1(50 is the typical model of its size class)MAMOX630-36HFN10-M3Xwith ducted air handler MAMVBC-36HWFN10-MC3E-D2 of 2 models qualify · AHRI 216621513
Ducted, 3.5–4.5 tonsNo models in this size class68.8(50 is the typical model of its size class)MAMOX630-48HFN10-M3Xwith ducted air handler MAMVBC-48HWFN10-MD3E-D2 of 2 models qualify · AHRI 216621514

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 typeFirst Co.All-around score, best modelMITS AIRAll-around score, best model
Ducted, up to 1.5 tons25.1(50 is the typical model of its size class)18WHHPBAwith ducted air handler 37CLX(*,Q,W)11 of 11 models have all five ratings · AHRI 21683193171.7(50 is the typical model of its size class) (higher)MAMOX430-18HFN10-M3Xwith ducted air handler MAMVBC-18HWFN10-MB3E-D1 of 1 models have all five ratings · AHRI 216621510
Ducted, 2 tons30.4(50 is the typical model of its size class)24WHHPBAwith ducted air handler 37CLX(*,Q,W)7 of 7 models have all five ratings · AHRI 21683193261.0(50 is the typical model of its size class) (higher)MAMOX430-24HFN10-M3Xwith ducted air handler MAMVBC-24HWFN10-MB3E-D1 of 1 models have all five ratings · AHRI 216621511
Ducted, 2.5–3 tons20.0(50 is the typical model of its size class)30WHHPBAwith ducted air handler 37CLX(*,Q,W)3 of 3 models have all five ratings · AHRI 21683193367.3(50 is the typical model of its size class) (higher)MAMOX630-36HFN10-M3Xwith ducted air handler MAMVBC-36HWFN10-MC3E-D2 of 2 models have all five ratings · AHRI 216621513
Ducted, 3.5–4.5 tonsNo models in this size class57.1(50 is the typical model of its size class)MAMOX630-48HFN10-M3Xwith ducted air handler MAMVBC-48HWFN10-MD3E-D2 of 2 models have all five ratings · AHRI 216621514

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
RatingFirst Co.MITS AIR
COP at 5°Fbeats 63% · 2.00EHE12***D***AAlso listed as EHE12***E***ADucted, up to 1.5 tonsbeats 72% · 2.06MAMOX430-18HFN10-M3XDucted, up to 1.5 tons
Capacity retention at 5°Fbeats 24% · 54%EPE30***DAlso listed as EPE30***EDucted, 2.5–3 tonsbeats 97% · 107%MAMOD30-30HFN10-M3XDucted, 2.5–3 tons
HSPF2beats 16% · 6.830WHHPBADucted, 2.5–3 tonsbeats 91% · 10.3MAMOX630-36HFN10-M3XDucted, 2.5–3 tons
SEER2beats 20% · 14.218WHHPBADucted, up to 1.5 tonsbeats 66% · 19.0MAMOX430-18HFN10-M3XDucted, up to 1.5 tons
EER2beats 76% · 12.518WHHPBADucted, up to 1.5 tonsbeats 76% · 12.5MAMOX430-18HFN10-M3XDucted, up to 1.5 tons
Heating capacity at 5°Fbeats 38% · 8,000 Btu/hEHE18***D***AAlso listed as EHE18***E***ADucted, up to 1.5 tonsbeats 97% · 39,000 Btu/hMAMOX630-36HFN10-M3XDucted, 2.5–3 tons

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