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MAXI AIR heat pump efficiency: 10 outdoor models compared

MAXI AIR has 10 heat pump outdoor models certified with this refrigerant group, in 34 AHRI-certified combinations. Each model is compared with models of the same size and duct type, so the scores below do not depend on which sizes MAXI AIR makes. MAXI AIR has no QMID (IRS Qualified Manufacturer ID) on file, so it is not ranked against other manufacturers.

New to heat pump ratings? The Simple view explains them in plain words →

ManufacturerData as of updated · sources

Outdoor models
10
AHRI certifications
34
Efficiency index
75%
Typical model vs same-size, same-type peers (16 models)
Meet CEE 2025
100%
10 models

How MAXI AIR compares with comparable models

For each rating: the share of same-size, same-type models that a typical model of this manufacturer beats (50% is typical), its rank, and the raw median for context. Raw medians are not comparable across manufacturers that make different sizes.
MAXI AIR against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of MAXI AIR’s own modelsMAXI AIR is strongest on heating capacity at 5°F (its typical model beats 84% of comparable models) and weakest on COP at 5°F (51%).
  • MAXI AIR
  • Middle half of its models
  • Other ranked manufacturers
MAXI AIR

Source: AHRI Directory, NEEP · as of

Average peer percentile of MAXI AIR’s models
RatingBeats comparable modelsRankRaw median
Efficiency index16 models scored75%Not ranked—
COP at 5°F16 models scored51%Not ranked2.00
Capacity retention at 5°F16 models scored83%Not ranked98%
HSPF216 models scored83%Not ranked10.5
SEER216 models scored77%Not ranked23.0
EER216 models scored77%Not ranked12.8
Heating capacity at 5°F16 models scored84%Not ranked27,000 Btu/h

Standards met

Share of MAXI AIR’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)100%10
CEE 2026 Tier 1 (Split ASHP)100%10
CEE Advanced Tier (Split ASHP)0%0
Xcel Energy Colorado cold-climate ASHP (2025)100%10
DOE Cold Climate Heat Pump Challenge0%0
ENERGY STAR Cold Climate70%7

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
MAXI AIR’s models inside each size and duct typeShape: every model of the group · blue: the middle half of this manufacturer’s models there, median dot, 10th–90th percentile line
  • MAXI AIR (median, middle 50%, 10th–90th)
  • All models of the group
Ducted, up to 1.5 tons1.901,783 modelsDucted, 2.5–3 tons2.001,909 modelsDucted, 3.5–4.5 tons2.002,224 modelsNon-ducted, up to 1.5 tons1.953,455 modelsNon-ducted, 2.5–3 tons2.001,106 modelsmedian

Source: AHRI Directory · as of

Share of comparable models beaten, per peer group
Size and duct typeModelsIndexCOP@5°FHSPF2SEER2
Ducted, up to 1.5 tons277%63%79%83%
Ducted, 2.5–3 tons577%53%87%79%
Ducted, 3.5–4.5 tons149%21%73%54%
Non-ducted, up to 1.5 tons475%48%80%80%
Non-ducted, 2.5–3 tons476%53%85%76%

Every MAXI AIR model in the market

MAXI AIR’s 16 models with a known size and duct type, over the shape of the whole catalog.
MAXI AIR models by size and ratingColoured: MAXI AIR · grey shapes: all 14,508 models · lines: catalog medians by size
  • MAXI AIR models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 16 maxi air models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 14,508 models, half a ton at a time.
Show the data as a table
COP at 5°F by size and duct type (every model, by rated cooling capacity)
Duct type, sizeModels10th pct.25thMedian75th90th
Ducted, 0.5 tons8261.641.711.751.852.24
Ducted, 1 ton4071.801.902.052.412.45
Ducted, 1.5 tons9921.751.862.002.172.40
Ducted, 2 tons9991.751.862.002.182.30
Ducted, 2.5 tons1,0401.701.802.002.102.36
Ducted, 3 tons6961.801.902.002.102.42
Ducted, 3.5 tons8651.701.802.002.102.46
Ducted, 4 tons7261.801.862.002.122.41
Ducted, 4.5 tons6901.701.801.902.102.20
Ducted, 5 tons861.892.002.102.102.10
Non-ducted, 0.5 tons1,1861.751.801.902.002.22
Non-ducted, 1 ton1,3431.801.801.992.102.21
Non-ducted, 1.5 tons1,2611.801.802.002.102.31
Non-ducted, 2 tons7611.801.982.002.102.30
Non-ducted, 2.5 tons4031.801.852.002.002.10
Non-ducted, 3 tons4731.901.982.002.032.20
Non-ducted, 3.5 tons2802.002.002.002.052.10
Non-ducted, 4 tons2041.962.002.052.102.11
Non-ducted, 4.5 tons781.901.911.952.012.01
Non-ducted, 5 tons841.992.002.052.202.20

Source: AHRI Directory · as of

Top MAXI AIR models

Its top five cold-climate picks and its top five all-around models across sizes (both scores compare each model with models of its own size and duct type, so sizes compare), then, on each single rating, the model that beats the largest share of comparable models.

Cold-climate picks

Top 5 MAXI AIR cold-climate picks across sizes. 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.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2Btu/h @5°FSEER2MeetsCombosAHRI ref.Compared withScore
1T55-MULTI36E454MAXI AIR · T55 SeriesAlso listed as T55-MULTI36E4543 tons36,000 Btu/h · Ducted106%2.0010.438,00019.4CEE 25CEE 26Xcel3217752780Ducted, 2.5–3 tons82.5
2T55-MULTI36E454MAXI AIR · T55 SeriesAlso listed as T55-MULTI36E4543 tons36,000 Btu/h · Non-ducted103%2.0010.637,00021.2CEE 25CEE 26Xcel3217752781Non-ducted, 2.5–3 tons78.0
3T55-AES18EXT454MAXI AIR · T55 Serieswith ductless indoor unit T55-AES18INT4541.5 tons18,000 Btu/h · Non-ducted100%1.9211.018,00021.4CEE 25CEE 26XcelES CC2217752773Non-ducted, up to 1.5 tons73.8
4T55-MULTI18E454MAXI AIR · T55 SeriesAlso listed as T55-MULTI18E4541.5 tons19,000 Btu/h · Non-ducted95%2.0010.419,00025.0CEE 25CEE 26Xcel3218381879Non-ducted, up to 1.5 tons73.1
5T55-MULTI28E454MAXI AIR · T55 SeriesAlso listed as T55-MULTI28E4542.5 tons27,000 Btu/h · Non-ducted100%2.0010.527,00023.0CEE 25CEE 26Xcel3217752776Non-ducted, 2.5–3 tons72.9

All-around best

Top 5 MAXI AIR models on the all-around score across sizes. 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.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2SEER2EER2MeetsCombosAHRI ref.Compared withScoreHeating halfCooling halfCold-climate score
1T55-MULTI36E454MAXI AIR · T55 SeriesAlso listed as T55-MULTI36E4543 tons36,000 Btu/h · Ducted106%2.0010.419.412.0CEE 25CEE 26Xcel3217752780Ducted, 2.5–3 tons83.682.584.882.5
2T55-MULTI18E454MAXI AIR · T55 SeriesAlso listed as T55-MULTI18E4541.5 tons19,000 Btu/h · Non-ducted95%2.0010.425.015.0CEE 25CEE 26Xcel3218381879Non-ducted, up to 1.5 tons81.973.190.873.1
3T55-MULTI36E454MAXI AIR · T55 SeriesAlso listed as T55-MULTI36E4543 tons36,000 Btu/h · Non-ducted100%2.0010.723.013.0CEE 25CEE 26Xcel3217752779Non-ducted, 2.5–3 tons78.376.080.678.0
4T55-MULTI18E454MAXI AIR · T55 SeriesAlso listed as T55-MULTI18E4541.5 tons19,000 Btu/h · Ducted90%2.0010.020.013.0CEE 25CEE 26Xcel3218381880Ducted, up to 1.5 tons77.470.884.070.8
5T55-MULTI28E454MAXI AIR · T55 SeriesAlso listed as T55-MULTI28E4542.5 tons28,000 Btu/h · Ducted96%2.009.519.012.0CEE 25CEE 26Xcel3217752777Ducted, 2.5–3 tons77.472.782.172.7

Best model on each rating

MAXI AIR’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FT55-MULTI18E454Also listed as T55-MULTI18E4542.00Ducted, up to 1.5 tons63%218381880
Capacity retention at 5°FMAXS-2430-454107%Ducted, 2.5–3 tons97%218374112
HSPF2T55-MULTI36E454Also listed as T55-MULTI36E45410.4Ducted, 2.5–3 tons94%217752780
SEER2T55-AES12EXT45425.4Non-ducted, up to 1.5 tons88%217752772
EER2T55-MULTI18E454Also listed as T55-MULTI18E45415.0Non-ducted, up to 1.5 tons91%218381879
Heating capacity at 5°FT55-MULTI18E454Also listed as T55-MULTI18E45419,000 Btu/hNon-ducted, up to 1.5 tons97%218381879

All 10 MAXI AIR models in Explore

MAXI AIR size class by size class: cold-climate and all-around

Its best model on each board in every size and duct type it makes. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there). Cold-climate picks must keep at least 70% of their heat at 5°F; the all-around score needs all five ratings and has no such bar.
MAXI AIR: best cold-climate pick and best all-around model per size and duct type, with how many of its models are on each board (top 5 and 5 per class are in the snapshot)
Size and duct typeCold-climate pickCold-climate score, best modelAll-around bestAll-around score, best model
Ducted, up to 1.5 tons70.8(50 is the typical model of its size class)T55-MULTI18E454Also listed as T55-MULTI18E4542 of 2 models qualify · AHRI 21838188077.4(50 is the typical model of its size class)T55-MULTI18E454Also listed as T55-MULTI18E4542 of 2 models have all five ratings · AHRI 218381880
Ducted, 2.5–3 tons82.5(50 is the typical model of its size class)T55-MULTI36E454Also listed as T55-MULTI36E4545 of 5 models qualify · AHRI 21775278083.6(50 is the typical model of its size class)T55-MULTI36E454Also listed as T55-MULTI36E4545 of 5 models have all five ratings · AHRI 217752780
Ducted, 3.5–4.5 tons60.5(50 is the typical model of its size class)MAXS-4260-454with ducted air handler AHMS-6020-4541 of 1 models qualify · AHRI 21775276749.1(50 is the typical model of its size class)MAXS-4260-454with ducted air handler AHMS-6020-4541 of 1 models have all five ratings · AHRI 217752767
Non-ducted, up to 1.5 tons73.8(50 is the typical model of its size class)T55-AES18EXT454with ductless indoor unit T55-AES18INT4544 of 4 models qualify · AHRI 21775277381.9(50 is the typical model of its size class)T55-MULTI18E454Also listed as T55-MULTI18E4544 of 4 models have all five ratings · AHRI 218381879
Non-ducted, 2.5–3 tons78.0(50 is the typical model of its size class)T55-MULTI36E454Also listed as T55-MULTI36E4544 of 4 models qualify · AHRI 21775278178.3(50 is the typical model of its size class)T55-MULTI36E454Also listed as T55-MULTI36E4544 of 4 models have all five ratings · AHRI 217752779

All-around board, every manufacturer

Newest MAXI AIR certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified MAXI AIR outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
T55-MULTI18E454*MAXI AIR · T55 Series1.5 tons19,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)2.0093%10.222.5CEE 25CEE 26XcelES CC3218386542
MAXS-4260-454MAXI AIR · MAXS Serieswith ducted air handler F32-MVBM60C284.5 tons52,000 Btu/h · Ducted1.8080%8.516.0CEE 25CEE 26XcelES CC4218382947
MAXS-2430-454MAXI AIR · MAXS Serieswith ducted air handler F32-MVBM36C242.5 tons29,000 Btu/h · Ducted1.85107%9.616.0CEE 25CEE 26XcelES CC8218382946
T55-MULTI18E454MAXI AIR · T55 Series1.5 tons19,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)2.0093%10.222.5CEE 25CEE 26Xcel3218381881
T55-MULTI36E454*MAXI AIR · T55 Series3 tons36,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)2.00103%10.621.2CEE 25CEE 26XcelES CC3217754316

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Manufacturers of a similar size, side by side.

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MAXI AIR includes these brand names as listed in AHRI: MAXI AIR. Standards are checked against published thresholds; program rules beyond ratings are not checked.