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Acekool heat pump efficiency: 13 outdoor models compared

Acekool has 13 heat pump outdoor models certified with this refrigerant group, in 13 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 Acekool makes. Acekool 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
13
AHRI certifications
13
Efficiency index
36%
Typical model vs same-size, same-type peers (13 models)
Meet CEE 2025
84.6%
11 models

How Acekool 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.
Acekool against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of Acekool’s own modelsAcekool is strongest on SEER2 (its typical model beats 46% of comparable models) and weakest on COP at 5°F (21%).
  • Acekool
  • Middle half of its models
  • Other ranked manufacturers
Acekool

Source: AHRI Directory, NEEP · as of

Average peer percentile of Acekool’s models
RatingBeats comparable modelsRankRaw median
Efficiency index13 models scored36%Not ranked—
COP at 5°F13 models scored21%Not ranked1.80
Capacity retention at 5°F13 models scored39%Not ranked70%
HSPF213 models scored32%Not ranked8.5
SEER213 models scored46%Not ranked19.0
EER213 models scored38%Not ranked10.0
Heating capacity at 5°F13 models scored35%Not ranked8,700 Btu/h

Standards met

Share of Acekool’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)84.6%11
CEE 2026 Tier 1 (Split ASHP)76.9%10
CEE Advanced Tier (Split ASHP)0%0
Xcel Energy Colorado cold-climate ASHP (2025)61.5%8
DOE Cold Climate Heat Pump Challenge0%0
ENERGY STAR Cold Climate30.8%4

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
Acekool’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
  • Acekool (median, middle 50%, 10th–90th)
  • All models of the group
Non-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsmedian

Source: AHRI Directory · as of

Share of comparable models beaten, per peer group
Size and duct typeModelsIndexCOP@5°FHSPF2SEER2
Non-ducted, up to 1.5 tons1037%21%31%47%
Non-ducted, 2 tons235%26%36%42%
Non-ducted, 2.5–3 tons123%15%26%36%

Every Acekool model in the market

Acekool’s 13 models with a known size and duct type, over the shape of the whole catalog.
Acekool models by size and ratingColoured: Acekool · grey shapes: all 11,475 models · lines: catalog medians by size
  • Acekool models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 13 acekool models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 11,475 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 tons1751.701.851.902.102.26
Ducted, 1 ton3401.851.902.002.402.65
Ducted, 1.5 tons7891.751.852.002.202.55
Ducted, 2 tons7821.731.802.002.102.33
Ducted, 2.5 tons7351.711.801.902.092.48
Ducted, 3 tons6521.681.701.902.062.36
Ducted, 3.5 tons6411.611.801.952.202.50
Ducted, 4 tons3671.701.801.912.022.52
Ducted, 4.5 tons5441.701.801.912.082.34
Ducted, 5 tons251.801.801.901.902.15
Non-ducted, 0.5 tons7171.751.811.972.102.19
Non-ducted, 1 ton1,0641.751.801.902.072.25
Non-ducted, 1.5 tons8861.801.801.872.072.21
Non-ducted, 2 tons5641.801.801.832.042.21
Non-ducted, 2.5 tons2751.801.811.841.862.03
Non-ducted, 3 tons5021.801.801.902.002.09
Non-ducted, 3.5 tons701.821.831.902.002.28
Non-ducted, 4 tons2631.801.801.982.002.10
Non-ducted, 4.5 tons1031.771.771.801.972.02
Non-ducted, 5 tons291.982.002.102.302.47

Source: AHRI Directory · as of

Top Acekool 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 Acekool 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
1CMS12-2 PROACEKOOL · Prowith ductless indoor unit CMS12-2 PRO1 ton12,000 Btu/h · Non-ducted76%1.809.59,10023.0CEE 25CEE 26XcelES CC1216980963Non-ducted, up to 1.5 tons47.5
2CMS9-2 PROACEKOOL · Prowith ductless indoor unit CMS9-2 PRO1 ton9,000 Btu/h · Non-ducted77%1.809.27,30023.5CEE 25CEE 26XcelES CC1216980962Non-ducted, up to 1.5 tons45.8
3CMS9 PROAcekool · Prowith ductless indoor unit CMS9 PRO1 ton9,000 Btu/h · Non-ducted74%1.809.07,00023.0CEE 25CEE 26XcelES CC1213857783Non-ducted, up to 1.5 tons39.9
4CMS18 PROAcekool · Prowith ductless indoor unit CMS18 PRO1 ton12,000 Btu/h · Non-ducted73%1.809.08,70022.0CEE 25CEE 26XcelES CC1213857784Non-ducted, up to 1.5 tons39.1
5CMS12Acekoolwith ductless indoor unit CMS12Also listed as CMS12-21 ton12,000 Btu/h · Non-ducted70%1.808.58,60019.0CEE 25CEE 26Xcel1213804780Non-ducted, up to 1.5 tons28.4

All-around best

Top 5 Acekool 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
1CMS9-2 PROACEKOOL · Prowith ductless indoor unit CMS9-2 PRO1 ton9,000 Btu/h · Non-ducted77%1.809.223.513.0CEE 25CEE 26XcelES CC1216980962Non-ducted, up to 1.5 tons60.645.875.445.8
2CMS12-2 PROACEKOOL · Prowith ductless indoor unit CMS12-2 PRO1 ton12,000 Btu/h · Non-ducted76%1.809.523.013.0CEE 25CEE 26XcelES CC1216980963Non-ducted, up to 1.5 tons60.247.572.947.5
3CMS9 PROAcekool · Prowith ductless indoor unit CMS9 PRO1 ton9,000 Btu/h · Non-ducted74%1.809.023.012.5CEE 25CEE 26XcelES CC1213857783Non-ducted, up to 1.5 tons51.339.962.739.9
4CMS12 PROAcekool · Prowith ductless indoor unit CMS12 PRO1.5 tons18,000 Btu/h · Non-ducted66%1.809.022.013.0CEE 25CEE 261213857785Non-ducted, up to 1.5 tons48.229.666.8Not a pick
5CMS18 PROAcekool · Prowith ductless indoor unit CMS18 PRO1 ton12,000 Btu/h · Non-ducted73%1.809.022.012.5CEE 25CEE 26XcelES CC1213857784Non-ducted, up to 1.5 tons47.939.156.739.1

Best model on each rating

Acekool’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FCMS241.80Non-ducted, 2 tons26%213804782
Capacity retention at 5°FCMS9-2 PRO77%Non-ducted, up to 1.5 tons64%216980962
HSPF2CMS12-2 PRO9.5Non-ducted, up to 1.5 tons57%216980963
SEER2CMS9-2 PRO23.5Non-ducted, up to 1.5 tons79%216980962
EER2CMS12 PRO13.0Non-ducted, up to 1.5 tons68%213857785
Heating capacity at 5°FCMS12 PRO11,900 Btu/hNon-ducted, up to 1.5 tons66%213857785

All 13 Acekool models in Explore

Acekool 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.
Acekool: 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
Non-ducted, up to 1.5 tons47.5(50 is the typical model of its size class)CMS12-2 PROwith ductless indoor unit CMS12-2 PRO8 of 10 models qualify · AHRI 21698096360.6(50 is the typical model of its size class)CMS9-2 PROwith ductless indoor unit CMS9-2 PRO10 of 10 models have all five ratings · AHRI 216980962
Non-ducted, 2 tonsNone on this board (0 of 2 models qualify)46.0(50 is the typical model of its size class)CMS24 PROwith ductless indoor unit CMS24 PRO2 of 2 models have all five ratings · AHRI 213857786
Non-ducted, 2.5–3 tonsNone on this board (0 of 1 models qualify)23.4(50 is the typical model of its size class)CMS36with ductless indoor unit CMS361 of 1 models have all five ratings · AHRI 213804783

All-around board, every manufacturer

Newest Acekool certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified Acekool outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
CMS12-2 PROACEKOOL · Prowith ductless indoor unit CMS12-2 PRO1 ton12,000 Btu/h · Non-ducted1.8076%9.523.0CEE 25CEE 26XcelES CC1216980963
CMS9-2 PROACEKOOL · Prowith ductless indoor unit CMS9-2 PRO1 ton9,000 Btu/h · Non-ducted1.8077%9.223.5CEE 25CEE 26XcelES CC1216980962
CMS12-2ACEKOOLwith ductless indoor unit CMS12-21 ton12,000 Btu/h · Non-ducted1.8070%8.519.0CEE 25CEE 26Xcel1216962325
CMS9-2ACEKOOLwith ductless indoor unit CMS9-21 ton9,000 Btu/h · Non-ducted1.8070%8.519.0CEE 25CEE 26Xcel1216962323
CMS24 PROAcekool · Prowith ductless indoor unit CMS24 PRO2 tons23,000 Btu/h · Non-ducted1.8067%9.020.0CEE 25CEE 261213857786

Shares hardware with

Manufacturers whose models are the same equipment under another badge. About OEM families

No shared hardware found for Acekool in this group.

Compare Acekool

Manufacturers of a similar size, side by side.

Compare with any manufacturer

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