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MULTIZONE heat pump efficiency: 9 outdoor models compared

MULTIZONE has 9 heat pump outdoor models certified with this refrigerant group, in 9 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 MULTIZONE makes. MULTIZONE 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
9
AHRI certifications
9
Efficiency index
47%
Typical model vs same-size, same-type peers (2 models)
Meet CEE 2025
22.2%
2 models

How MULTIZONE 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.
MULTIZONE against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of MULTIZONE’s own modelsMULTIZONE is strongest on heating capacity at 5°F (its typical model beats 51% of comparable models) and weakest on COP at 5°F (14%).
  • MULTIZONE
  • Middle half of its models
  • Other ranked manufacturers
MULTIZONE

Source: AHRI Directory, NEEP · as of

Average peer percentile of MULTIZONE’s models
RatingBeats comparable modelsRankRaw median
Efficiency index2 models scored47%Not ranked—
COP at 5°F2 models scored14%Not ranked1.78
Capacity retention at 5°F2 models scored33%Not ranked68%
HSPF29 models scored23%Not ranked8.5
SEER29 models scored31%Not ranked18.5
EER29 models scored47%Not ranked10.9
Heating capacity at 5°F2 models scored51%Not ranked10,150 Btu/h

Standards met

Share of MULTIZONE’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)22.2%2
CEE 2026 Tier 1 (Split ASHP)22.2%2
CEE Advanced Tier (Split ASHP)0%0
Xcel Energy Colorado cold-climate ASHP (2025)11.1%1
DOE Cold Climate Heat Pump Challenge0%0
ENERGY STAR Cold Climate0%0

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
MULTIZONE’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
  • MULTIZONE (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 tons647%14%20%31%
Non-ducted, 2 tons2——23%30%
Non-ducted, 2.5–3 tons1——48%30%

Every MULTIZONE model in the market

MULTIZONE’s 9 models with a known size and duct type, over the shape of the whole catalog.
MULTIZONE models by size and ratingColoured: MULTIZONE · grey shapes: all 11,475 models · lines: catalog medians by size
  • MULTIZONE models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 9 multizone 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 MULTIZONE 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 1 MULTIZONE 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
1MIT12H2G31(O)MULTIZONEwith ductless indoor unit MIT12H2G31(I)1 ton12,000 Btu/h · Non-ducted70%1.759.58,40021.0CEE 25CEE 26Xcel19850218Non-ducted, up to 1.5 tons34.7

All-around best

Top 2 MULTIZONE 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
1MIT18H2G31(O)MULTIZONEwith ductless indoor unit MIT18H2G31(I)1.5 tons18,000 Btu/h · Non-ducted66%1.808.622.513.0CEE 25CEE 2619850219Non-ducted, up to 1.5 tons46.823.969.8Not a pick
2MIT12H2G31(O)MULTIZONEwith ductless indoor unit MIT12H2G31(I)1 ton12,000 Btu/h · Non-ducted70%1.759.521.013.0CEE 25CEE 26Xcel19850218Non-ducted, up to 1.5 tons46.734.758.734.7

Best model on each rating

MULTIZONE’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FMIT18H2G31(O)1.80Non-ducted, up to 1.5 tons22%9850219
Capacity retention at 5°FMIT12H2G31(O)70%Non-ducted, up to 1.5 tons39%9850218
HSPF2MIT12H2G31(O)9.5Non-ducted, up to 1.5 tons57%9850218
SEER2MIT18H2G31(O)22.5Non-ducted, up to 1.5 tons67%9850219
EER2MIT09H2G31(O)13.7Non-ducted, up to 1.5 tons80%9850217
Heating capacity at 5°FMIT18H2G31(O)11,900 Btu/hNon-ducted, up to 1.5 tons66%9850219

All 9 MULTIZONE models in Explore

MULTIZONE 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.
MULTIZONE: 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 tons34.7(50 is the typical model of its size class)MIT12H2G31(O)with ductless indoor unit MIT12H2G31(I)1 of 6 models qualify · AHRI 985021846.8(50 is the typical model of its size class)MIT18H2G31(O)with ductless indoor unit MIT18H2G31(I)2 of 6 models have all five ratings · AHRI 9850219
Non-ducted, 2 tonsNone on this board (0 of 2 models qualify)None on this board (0 of 2 models have all five ratings)
Non-ducted, 2.5–3 tonsNone on this board (0 of 1 models qualify)None on this board (0 of 1 models have all five ratings)

All-around board, every manufacturer

Newest MULTIZONE certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified MULTIZONE outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
MIL31H2G31(O)MULTIZONEwith ductless indoor unit MIL31H2G31(I)2.5 tons30,000 Btu/h · Non-ducted——9.018.5None19850223
MIT24H2G31(O)MULTIZONEwith ductless indoor unit MIT24H2G31(I)2 tons23,000 Btu/h · Non-ducted——8.620.5None19850222
MIL24H2G31(O)MULTIZONEwith ductless indoor unit MIL24H2G31(I)2 tons24,000 Btu/h · Non-ducted——8.016.5None19850221
MIL18H2G31(O)MULTIZONEwith ductless indoor unit MIL18H2G31(I)1.5 tons18,000 Btu/h · Non-ducted——8.017.0None19850220
MIT18H2G31(O)MULTIZONEwith ductless indoor unit MIT18H2G31(I)1.5 tons18,000 Btu/h · Non-ducted1.8066%8.622.5CEE 25CEE 2619850219

Shares hardware with

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

No shared hardware found for MULTIZONE in this group.

Compare MULTIZONE

Manufacturers of a similar size, side by side.

Compare with any manufacturer

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