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THERMAL ZONE heat pump efficiency: 101 outdoor models compared

THERMAL ZONE has 101 heat pump outdoor models certified with this refrigerant group, in 1,006 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 THERMAL ZONE makes. THERMAL ZONE 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
101
AHRI certifications
1,006
Efficiency index
30%
Typical model vs same-size, same-type peers (60 models)
Meet CEE 2025
7.9%
8 models

How THERMAL ZONE 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.
THERMAL ZONE against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of THERMAL ZONE’s own modelsTHERMAL ZONE is strongest on COP at 5°F (its typical model beats 40% of comparable models) and weakest on HSPF2 (23%).
  • THERMAL ZONE
  • Middle half of its models
  • Other ranked manufacturers
THERMAL …

Source: AHRI Directory, NEEP · as of

Average peer percentile of THERMAL ZONE’s models
RatingBeats comparable modelsRankRaw median
Efficiency index60 models scored30%Not ranked—
COP at 5°F60 models scored40%Not ranked1.86
Capacity retention at 5°F60 models scored26%Not ranked46%
HSPF2101 models scored23%Not ranked7.2
SEER2101 models scored24%Not ranked14.3
EER2101 models scored31%Not ranked10.6
Heating capacity at 5°F60 models scored29%Not ranked18,550 Btu/h

Standards met

Share of THERMAL ZONE’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)7.9%8
CEE 2026 Tier 1 (Split ASHP)5.9%6
CEE Advanced Tier (Split ASHP)0%0
Xcel Energy Colorado cold-climate ASHP (2025)7.9%8
DOE Cold Climate Heat Pump Challenge0%0
ENERGY STAR Cold Climate7.9%8

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
THERMAL ZONE’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
  • THERMAL ZONE (median, middle 50%, 10th–90th)
  • 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 modelsDucted, 5 tons and up2.00321 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 tons534%80%19%33%
Ducted, 2 tons1133%46%26%28%
Ducted, 2.5–3 tons3026%40%19%20%
Ducted, 3.5–4.5 tons3831%35%24%24%
Ducted, 5 tons and up1728%16%26%27%

Every THERMAL ZONE model in the market

THERMAL ZONE’s 101 models with a known size and duct type, over the shape of the whole catalog.
THERMAL ZONE models by size and ratingColoured: THERMAL ZONE · grey shapes: all 14,508 models · lines: catalog medians by size
  • THERMAL ZONE models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 101 thermal zone 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 tons8641.701.802.002.102.46
Ducted, 4 tons7271.801.862.002.122.40
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 THERMAL ZONE 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 THERMAL ZONE 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
1TZP15AY24AJ2NTHERMAL ZONEwith ducted air handler L(E,F)W30BJ2 tons21,800 Btu/h · Ducted102%2.887.821,40015.2Xcel38217200648Ducted, 2 tons75.5
2TZP15AY30AJ2NTHERMAL ZONEwith ducted air handler L(E,F)W30CJ2 tons26,200 Btu/h · Ducted102%2.677.827,00015.2Xcel80217200651Ducted, 2 tons74.1
3TZP15AY36AJ2NTHERMAL ZONEwith ducted air handler AEW37J+TDR2.5 tons31,600 Btu/h · Ducted102%2.667.531,80014.5None76217200653Ducted, 2.5–3 tons72.6
4TZP15AY18AJ2NTHERMAL ZONEwith ducted air handler PE(S,T)23J1.5 tons15,800 Btu/h · Ducted130%2.517.821,00015.2XcelES CC30217200657Ducted, up to 1.5 tons72.0
5TZID36H520ZCThermal Zonewith ducted air handler M36G34*+TXV+AMHE4D2 tons23,400 Btu/h · Ducted88%2.109.419,60018.0CEE 25CEE 26XcelES CC3218750016Ducted, 2 tons69.4

All-around best

Top 5 THERMAL ZONE 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
1TZID36H520ZCThermal Zone · TZID36H520ZCwith ducted air handler TZID24H520ZA2 tons24,000 Btu/h · Ducted83%2.109.420.013.3CEE 25CEE 26XcelES CC3217495954Ducted, 2 tons79.667.292.169.4
2TZID60H520ZCThermal Zone · TZID60H520ZCwith ducted air handler TZID48H520ZA4 tons47,500 Btu/h · Ducted71%2.109.017.511.3CEE 25CEE 26XcelES CC2217589556Ducted, 3.5–4.5 tons64.463.964.964.7
3TZP15AY36AJ2NTHERMAL ZONEwith ducted air handler AEW37J+TDR2.5 tons31,600 Btu/h · Ducted102%2.667.514.511.7None76217200653Ducted, 2.5–3 tons58.772.644.772.6
4TZP15AY18AJ2NTHERMAL ZONEwith ducted air handler L(E,F)W30BJ1.5 tons16,400 Btu/h · Ducted103%2.737.815.211.7XcelES CC30217200644Ducted, up to 1.5 tons57.970.844.972.0
5TZP15AY24AJ2NTHERMAL ZONEwith ducted air handler L(E,F)W30BJ2 tons21,800 Btu/h · Ducted102%2.887.815.211.7Xcel38217200648Ducted, 2 tons56.775.538.075.5

Best model on each rating

THERMAL ZONE’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FTZP15AY18AJ2N2.73Ducted, up to 1.5 tons99%217200644
Capacity retention at 5°FTZP15AY18AJ2N130%Ducted, up to 1.5 tons100%217200657
HSPF2TZID24H520ZCS9.7Ducted, 2 tons74%218043394
SEER2TZID36H520ZC20.0Ducted, 2 tons87%217495954
EER2TZID36H520ZC13.3Ducted, 2 tons93%217495954
Heating capacity at 5°FTZP15AY18AJ2N21,000 Btu/hDucted, up to 1.5 tons99%217200657

All 101 THERMAL ZONE models in Explore

THERMAL ZONE 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.
THERMAL ZONE: 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 tons72.0(50 is the typical model of its size class)TZP15AY18AJ2Nwith ducted air handler PE(S,T)23J1 of 5 models qualify · AHRI 21720065757.9(50 is the typical model of its size class)TZP15AY18AJ2Nwith ducted air handler L(E,F)W30BJ4 of 4 models have all five ratings · AHRI 217200644
Ducted, 2 tons75.5(50 is the typical model of its size class)TZP15AY24AJ2Nwith ducted air handler L(E,F)W30BJ4 of 11 models qualify · AHRI 21720064879.6(50 is the typical model of its size class)TZID36H520ZCwith ducted air handler TZID24H520ZA12 of 12 models have all five ratings · AHRI 217495954
Ducted, 2.5–3 tons72.6(50 is the typical model of its size class)TZP15AY36AJ2Nwith ducted air handler AEW37J+TDR2 of 30 models qualify · AHRI 21720065358.7(50 is the typical model of its size class)TZP15AY36AJ2Nwith ducted air handler AEW37J+TDR16 of 29 models have all five ratings · AHRI 217200653
Ducted, 3.5–4.5 tons65.9(50 is the typical model of its size class)TZID48H520ZCSwith indoor coil TZID60H520ZACD and furnace MGV96U120D5C3 of 38 models qualify · AHRI 21878217164.4(50 is the typical model of its size class)TZID60H520ZCwith ducted air handler TZID48H520ZA19 of 37 models have all five ratings · AHRI 217589556
Ducted, 5 tons and upNone on this board (0 of 17 models qualify)56.6(50 is the typical model of its size class)TZP15AY60AJ2Nwith ducted air handler TZHDYTST6024*NAN9 of 19 models have all five ratings · AHRI 215415492

All-around board, every manufacturer

Newest THERMAL ZONE certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified THERMAL ZONE outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
TZP14AY48AJ2NTHERMAL ZONEwith ducted air handler AE*L+DM60A4J+TDR4 tons45,000 Btu/h · Ducted2.3760%7.514.3None75218827132
TZP14AY42AJ2NTHERMAL ZONEwith ducted air handler AE*L+DM60A4J+TDR3 tons37,000 Btu/h · Ducted2.5362%7.514.3None84218827131
TZP14AY36AJ2NTHERMAL ZONEwith ducted air handler AE*S+DM36A3J+TDR2.5 tons32,400 Btu/h · Ducted2.5066%7.514.3None81218827130
TZP14AY30AJ2NTHERMAL ZONEwith ducted air handler AE*S+DM36A3J+TDR2 tons26,800 Btu/h · Ducted2.2858%7.514.3None71218827128
TZP14AY24AJ2NTHERMAL ZONEwith ducted air handler AE*S+DM24A3J+TDR2 tons21,600 Btu/h · Ducted2.2957%7.514.3None46218827127

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