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ZEPHYR heat pump efficiency: 25 outdoor models compared

ZEPHYR has 25 heat pump outdoor models certified with this refrigerant group, in 31 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 ZEPHYR makes. ZEPHYR has no QMID (IRS Qualified Manufacturer ID) on file, so it is not ranked against other manufacturers.

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ManufacturerData as of updated · sources

Outdoor models
25
AHRI certifications
31
Efficiency index
58%
Typical model vs same-size, same-type peers (20 models)
Meet CEE 2025
76%
19 models

How ZEPHYR 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.
ZEPHYR against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of ZEPHYR’s own modelsZEPHYR is strongest on capacity retention at 5°F (its typical model beats 68% of comparable models) and weakest on COP at 5°F (40%).
  • ZEPHYR
  • Middle half of its models
  • Other ranked manufacturers
ZEPHYR

Source: AHRI Directory, NEEP · as of

Average peer percentile of ZEPHYR’s models
RatingBeats comparable modelsRankRaw median
Efficiency index20 models scored58%Not ranked—
COP at 5°F20 models scored40%Not ranked1.87
Capacity retention at 5°F20 models scored68%Not ranked80%
HSPF225 models scored43%Not ranked9.0
SEER225 models scored53%Not ranked21.0
EER225 models scored52%Not ranked12.5
Heating capacity at 5°F20 models scored63%Not ranked16,200 Btu/h

Standards met

Share of ZEPHYR’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)76%19
CEE 2026 Tier 1 (Split ASHP)76%19
CEE Advanced Tier (Split ASHP)0%0
Xcel Energy Colorado cold-climate ASHP (2025)76%19
DOE Cold Climate Heat Pump Challenge0%0
ENERGY STAR Cold Climate36%9

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
ZEPHYR’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
  • ZEPHYR (median, middle 50%, 10th–90th)
  • All models of the group
Ducted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsNon-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsNon-ducted, 3.5–4.5 tons1.97438 modelsmedian

Source: AHRI Directory · as of

Share of comparable models beaten, per peer group
Size and duct typeModelsIndexCOP@5°FHSPF2SEER2
Ducted, 2 tons146%50%68%58%
Ducted, 2.5–3 tons163%75%84%78%
Ducted, 3.5–4.5 tons251%38%64%81%
Non-ducted, up to 1.5 tons1558%36%38%47%
Non-ducted, 2 tons462%39%44%55%
Non-ducted, 2.5–3 tons170%45%48%65%
Non-ducted, 3.5–4.5 tons145%41%14%45%

Every ZEPHYR model in the market

ZEPHYR’s 25 models with a known size and duct type, over the shape of the whole catalog.
ZEPHYR models by size and ratingColoured: ZEPHYR · grey shapes: all 11,475 models · lines: catalog medians by size
  • ZEPHYR models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 25 zephyr 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 ZEPHYR 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 ZEPHYR 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
1ZE-36HPBZEPHYR · Hi ULTRA HDwith ducted air handler AH-36B3 tons34,000 Btu/h · Ducted76%2.059.526,00018.0CEE 25CEE 26XcelES CC1207036642Ducted, 2.5–3 tons75.1
2ZE-09UH24SCOZEPHYR · Hi MULTI Xtremewith ductless indoor unit ZE-09UH24SCI1 ton9,000 Btu/h · Non-ducted96%1.9410.58,60025.5CEE 25CEE 26XcelES CC1208287539Non-ducted, up to 1.5 tons72.9
3ZE-24CA22SEXTZEPHYRwith ductless indoor unit ZE-24CA22SINT2 tons23,000 Btu/h · Non-ducted89%2.138.620,50020.5CEE 25CEE 26Xcel1203446804Non-ducted, 2 tons64.0
4ZE-36M422SCOZEPHYR · Hi MULTI Xtreme2.5 tons32,000 Btu/h · Non-ducted113%1.849.036,00021.0CEE 25CEE 26XcelES CC2206347270Non-ducted, 2.5–3 tons64.0
5ZE-09CA22SEXTZEPHYRwith ductless indoor unit ZE-09CA22SINT1 ton9,000 Btu/h · Non-ducted80%2.079.07,20022.0CEE 25CEE 26Xcel1203446791Non-ducted, up to 1.5 tons60.5

All-around best

Top 5 ZEPHYR 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
1ZE-09UH24SCOZEPHYR · Hi MULTI Xtremewith ductless indoor unit ZE-09UH24SCI1 ton9,000 Btu/h · Non-ducted96%1.9410.525.514.5CEE 25CEE 26XcelES CC1208287539Non-ducted, up to 1.5 tons81.472.989.972.9
2ZE-36M422SCOZEPHYR · Hi MULTI Xtreme2.5 tons32,000 Btu/h · Non-ducted113%1.849.021.012.5CEE 25CEE 26XcelES CC2206347270Non-ducted, 2.5–3 tons69.564.075.064.0
3ZE-24M322SCOZEPHYR · Hi MULTI Xtreme2 tons24,000 Btu/h · Non-ducted100%1.809.122.012.5CEE 25CEE 26XcelES CC2206346130Non-ducted, 2 tons67.556.878.256.8
4ZE-09CA22SEXTZEPHYRwith ductless indoor unit ZE-09CA22SINT1 ton9,000 Btu/h · Non-ducted80%2.079.022.013.7CEE 25CEE 26Xcel1203446791Non-ducted, up to 1.5 tons66.760.572.860.5
5ZE-12UH24SCOZEPHYR · Hi MULTI Xtremewith ductless indoor unit ZE-12UH24SCI1 ton12,000 Btu/h · Non-ducted83%1.899.523.512.7CEE 25CEE 26XcelES CC1208287541Non-ducted, up to 1.5 tons65.058.271.758.2

Best model on each rating

ZEPHYR’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FZE-24CA22SEXT2.13Non-ducted, 2 tons81%203446804
Capacity retention at 5°FZE-36M422SCO113%Non-ducted, 2.5–3 tons99%206347270
HSPF2ZE-36HPB9.5Ducted, 2.5–3 tons83%207036642
SEER2ZE-09UH24SCO25.5Non-ducted, up to 1.5 tons89%208287539
EER2ZE-09UH24SCO14.5Non-ducted, up to 1.5 tons89%208287539
Heating capacity at 5°FZE-18M222SCO18,000 Btu/hNon-ducted, up to 1.5 tons92%206346128

All 25 ZEPHYR models in Explore

ZEPHYR 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.
ZEPHYR: 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, 2 tons57.5(50 is the typical model of its size class)ZE-24HPBwith ducted air handler AH-24B1 of 1 models qualify · AHRI 20703664046.3(50 is the typical model of its size class)ZE-24HPBwith ducted air handler AH-24B1 of 1 models have all five ratings · AHRI 207036640
Ducted, 2.5–3 tons75.1(50 is the typical model of its size class)ZE-36HPBwith ducted air handler AH-36B1 of 1 models qualify · AHRI 20703664263.2(50 is the typical model of its size class)ZE-36HPBwith ducted air handler AH-36B1 of 1 models have all five ratings · AHRI 207036642
Ducted, 3.5–4.5 tons56.6(50 is the typical model of its size class)ZE-48HPBwith ducted air handler AH-48B1 of 2 models qualify · AHRI 20703664657.3(50 is the typical model of its size class)ZE-48HPBwith ducted air handler AH-48B2 of 2 models have all five ratings · AHRI 207036646
Non-ducted, up to 1.5 tons72.9(50 is the typical model of its size class)ZE-09UH24SCOwith ductless indoor unit ZE-09UH24SCI11 of 15 models qualify · AHRI 20828753981.4(50 is the typical model of its size class)ZE-09UH24SCOwith ductless indoor unit ZE-09UH24SCI11 of 15 models have all five ratings · AHRI 208287539
Non-ducted, 2 tons64.0(50 is the typical model of its size class)ZE-24CA22SEXTwith ductless indoor unit ZE-24CA22SINT3 of 4 models qualify · AHRI 20344680467.5(50 is the typical model of its size class)ZE-24M322SCO3 of 4 models have all five ratings · AHRI 206346130
Non-ducted, 2.5–3 tons64.0(50 is the typical model of its size class)ZE-36M422SCO1 of 1 models qualify · AHRI 20634727069.5(50 is the typical model of its size class)ZE-36M422SCO1 of 1 models have all five ratings · AHRI 206347270
Non-ducted, 3.5–4.5 tons41.9(50 is the typical model of its size class)ZE-42M522SCO1 of 1 models qualify · AHRI 20634613544.5(50 is the typical model of its size class)ZE-42M522SCO1 of 1 models have all five ratings · AHRI 206346134

All-around board, every manufacturer

Newest ZEPHYR certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified ZEPHYR outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
ZE-12DA17EXTZEPHYRwith ductless indoor unit ZE-12DA17INT1 ton12,000 Btu/h · Non-ducted——8.017.5None1213361982
ZE-24UH24SCOZEPHYRwith ductless indoor unit ZE-24UH24SCI2 tons24,000 Btu/h · Non-ducted1.7695%10.021.0CEE 25CEE 26Xcel1208287545
ZE-18UH24SCOZEPHYRwith ductless indoor unit ZE-18UH24SCI1.5 tons18,000 Btu/h · Non-ducted1.8086%9.520.5CEE 25CEE 26Xcel1208287543
ZE-12UH24SCOZEPHYR · Hi MULTI Xtremewith ductless indoor unit ZE-12UH24SCI1 ton12,000 Btu/h · Non-ducted1.8983%9.523.5CEE 25CEE 26XcelES CC1208287541
ZE-09UH24SCOZEPHYR · Hi MULTI Xtremewith ductless indoor unit ZE-09UH24SCI1 ton9,000 Btu/h · Non-ducted1.9496%10.525.5CEE 25CEE 26XcelES CC1208287539

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