Skip to content
Rebate.Blue

Relief Sciences heat pump efficiency: 10 outdoor models compared

Relief Sciences has 10 heat pump outdoor models certified with this refrigerant group, in 22 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 Relief Sciences makes. Relief Sciences 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
22
Efficiency index
66%
Typical model vs same-size, same-type peers (16 models)
Meet CEE 2025
100%
10 models

How Relief Sciences 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.
Relief Sciences against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of Relief Sciences’s own modelsRelief Sciences is strongest on SEER2 (its typical model beats 76% of comparable models) and weakest on COP at 5°F (38%).
  • Relief Sciences
  • Middle half of its models
  • Other ranked manufacturers
Relief S…

Source: AHRI Directory, NEEP · as of

Average peer percentile of Relief Sciences’s models
RatingBeats comparable modelsRankRaw median
Efficiency index16 models scored66%Not ranked—
COP at 5°F16 models scored38%Not ranked1.88
Capacity retention at 5°F16 models scored72%Not ranked88%
HSPF216 models scored73%Not ranked10.0
SEER216 models scored76%Not ranked22.3
EER216 models scored67%Not ranked12.5
Heating capacity at 5°F16 models scored67%Not ranked18,221 Btu/h

Standards met

Share of Relief Sciences’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)90%9
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.
Relief Sciences’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
  • Relief Sciences (median, middle 50%, 10th–90th)
  • All models of the group
Ducted, up to 1.5 tons2.00884 modelsDucted, 2.5–3 tons1.901,614 modelsNon-ducted, up to 1.5 tons1.902,417 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
Ducted, up to 1.5 tons258%18%59%68%
Ducted, 2.5–3 tons469%28%82%92%
Non-ducted, up to 1.5 tons668%57%77%65%
Non-ducted, 2.5–3 tons464%30%67%79%

Every Relief Sciences model in the market

Relief Sciences’s 16 models with a known size and duct type, over the shape of the whole catalog.
Relief Sciences models by size and ratingColoured: Relief Sciences · grey shapes: all 11,475 models · lines: catalog medians by size
  • Relief Sciences models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 16 relief sciences 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 Relief Sciences 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 Relief Sciences 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
1LANG09OD25-1Relief Scienceswith ductless indoor unit LANG09ID-251 ton9,000 Btu/h · Non-ducted86%2.2211.68,56424.0CEE 25CEE 26Xcel1210655373Non-ducted, up to 1.5 tons86.0
2LANG12OD25-1Relief Scienceswith ductless indoor unit LANG12ID-251 ton12,000 Btu/h · Non-ducted74%2.2510.88,82023.1CEE 25CEE 26Xcel1210655374Non-ducted, up to 1.5 tons77.8
3LANG36OD35-4Relief Sciences3 tons36,000 Btu/h · Non-ducted102%1.909.736,60020.0CEE 25CEE 26Xcel3212615014Non-ducted, 2.5–3 tons76.5
4LANG12OD35-1Relief Scienceswith ductless indoor unit LANG12ID-251 ton12,000 Btu/h · Non-ducted101%1.9010.512,11323.1CEE 25CEE 26Xcel1212615012Non-ducted, up to 1.5 tons73.5
5LANG18OD35-1Relief Scienceswith ductless indoor unit LANG18ID-251.5 tons18,000 Btu/h · Non-ducted99%1.8410.617,74222.0CEE 25CEE 26Xcel1212615013Non-ducted, up to 1.5 tons67.6

All-around best

Top 5 Relief Sciences 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
1LANG09OD25-1Relief Scienceswith ductless indoor unit LANG09ID-251 ton9,000 Btu/h · Non-ducted86%2.2211.624.014.7CEE 25CEE 26Xcel1210655373Non-ducted, up to 1.5 tons86.786.087.586.0
2LANG12OD25-1Relief Scienceswith ductless indoor unit LANG12ID-251 ton12,000 Btu/h · Non-ducted74%2.2510.823.113.0CEE 25CEE 26Xcel1210655374Non-ducted, up to 1.5 tons75.977.874.177.8
3LANG27OD25-3Relief Sciences2.5 tons28,000 Btu/h · Ducted67%2.009.221.011.7CEE 25CEE 263210655379Ducted, 2.5–3 tons75.565.485.6Not a pick
4LANG12OD35-1Relief Scienceswith ductless indoor unit LANG12ID-251 ton12,000 Btu/h · Non-ducted101%1.9010.523.113.0CEE 25CEE 26Xcel1212615012Non-ducted, up to 1.5 tons73.873.574.173.5
5LANG27OD35-3Relief Sciences2.5 tons28,000 Btu/h · Ducted90%1.769.520.011.7CEE 25CEE 26Xcel3212615017Ducted, 2.5–3 tons73.865.082.665.0

Best model on each rating

Relief Sciences’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FLANG12OD25-12.25Non-ducted, up to 1.5 tons91%210655374
Capacity retention at 5°FLANG36OD35-4102%Non-ducted, 2.5–3 tons93%212615014
HSPF2LANG09OD25-111.6Non-ducted, up to 1.5 tons94%210655373
SEER2LANG27OD25-321.0Ducted, 2.5–3 tons98%210655379
EER2LANG09OD25-114.7Non-ducted, up to 1.5 tons90%210655373
Heating capacity at 5°FLANG18OD35-220,000 Btu/hNon-ducted, up to 1.5 tons96%212615018

All 10 Relief Sciences models in Explore

Relief Sciences 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.
Relief Sciences: 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 tons52.0(50 is the typical model of its size class)LANG18OD35-22 of 2 models qualify · AHRI 21261501959.4(50 is the typical model of its size class)LANG18OD35-22 of 2 models have all five ratings · AHRI 212615019
Ducted, 2.5–3 tons65.0(50 is the typical model of its size class)LANG27OD35-32 of 4 models qualify · AHRI 21261501775.5(50 is the typical model of its size class)LANG27OD25-34 of 4 models have all five ratings · AHRI 210655379
Non-ducted, up to 1.5 tons86.0(50 is the typical model of its size class)LANG09OD25-1with ductless indoor unit LANG09ID-256 of 6 models qualify · AHRI 21065537386.7(50 is the typical model of its size class)LANG09OD25-1with ductless indoor unit LANG09ID-256 of 6 models have all five ratings · AHRI 210655373
Non-ducted, 2.5–3 tons76.5(50 is the typical model of its size class)LANG36OD35-43 of 4 models qualify · AHRI 21261501472.3(50 is the typical model of its size class)LANG36OD35-44 of 4 models have all five ratings · AHRI 212615014

All-around board, every manufacturer

Newest Relief Sciences certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified Relief Sciences outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
LANG27OD35-3Relief Sciences2.5 tons28,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)1.7690%9.721.3CEE 25CEE 26Xcel3212615022
LANG36OD35-4Relief Sciences3 tons36,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)1.80101%9.919.5CEE 25CEE 26Xcel3212615021
LANG18OD35-2Relief Sciences1.5 tons19,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)1.83103%9.219.8CEE 25CEE 26Xcel3212615020
LANG18OD35-1Relief Scienceswith ductless indoor unit LANG18ID-251.5 tons18,000 Btu/h · Non-ducted1.8499%10.622.0CEE 25CEE 26Xcel1212615013
LANG12OD35-1Relief Scienceswith ductless indoor unit LANG12ID-251 ton12,000 Btu/h · Non-ducted1.90101%10.523.1CEE 25CEE 26Xcel1212615012

Shares hardware with

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

Compare Relief Sciences

Manufacturers of a similar size, side by side.

Compare with any manufacturer

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