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OLMO heat pump efficiency: 11 outdoor models compared

OLMO has 11 heat pump outdoor models certified with this refrigerant group, in 17 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 OLMO makes. OLMO 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
11
AHRI certifications
17
Efficiency index
43%
Typical model vs same-size, same-type peers (11 models)
Meet CEE 2025
90.9%
10 models

How OLMO 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.
OLMO against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of OLMO’s own modelsOLMO is strongest on EER2 (its typical model beats 50% of comparable models) and weakest on HSPF2 (33%).
  • OLMO
  • Middle half of its models
  • Other ranked manufacturers
OLMO

Source: AHRI Directory, NEEP · as of

Average peer percentile of OLMO’s models
RatingBeats comparable modelsRankRaw median
Efficiency index11 models scored43%Not ranked—
COP at 5°F11 models scored45%Not ranked1.98
Capacity retention at 5°F11 models scored40%Not ranked74%
HSPF211 models scored33%Not ranked9.0
SEER211 models scored45%Not ranked20.0
EER211 models scored50%Not ranked12.0
Heating capacity at 5°F11 models scored41%Not ranked18,000 Btu/h

Standards met

Share of OLMO’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)90.9%10
CEE 2026 Tier 1 (Split ASHP)81.8%9
CEE Advanced Tier (Split ASHP)0%0
Xcel Energy Colorado cold-climate ASHP (2025)54.5%6
DOE Cold Climate Heat Pump Challenge0%0
ENERGY STAR Cold Climate36.4%4

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
OLMO’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
  • OLMO (median, middle 50%, 10th–90th)
  • All models of the group
Non-ducted, up to 1.5 tons1.953,455 modelsNon-ducted, 2 tons2.00863 modelsNon-ducted, 2.5–3 tons2.001,106 modelsNon-ducted, 3.5–4.5 tons2.00564 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 tons643%67%33%38%
Non-ducted, 2 tons134%38%24%31%
Non-ducted, 2.5–3 tons347%17%41%55%
Non-ducted, 3.5–4.5 tons144%7%14%73%

Every OLMO model in the market

OLMO’s 11 models with a known size and duct type, over the shape of the whole catalog.
OLMO models by size and ratingColoured: OLMO · grey shapes: all 14,508 models · lines: catalog medians by size
  • OLMO models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 11 olmo 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 OLMO 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 OLMO 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
1OS-RMS18-230VOOLMO · SIERRA1.5 tons18,000 Btu/h · Non-ducted100%1.9910.018,00022.0CEE 25CEE 26XcelES CC1217739001Non-ducted, up to 1.5 tons69.5
2OS-SR18-230VOOLMO · SIERRAwith ductless indoor unit OS-18SRW-230VI1.5 tons18,000 Btu/h · Non-ducted76%2.499.813,70021.0CEE 25CEE 26Xcel2215887337Non-ducted, up to 1.5 tons69.0
3OS-RMS36-230VOOLMO · SIERRA3 tons36,000 Btu/h · Non-ducted100%1.9010.036,00022.0CEE 25CEE 26XcelES CC1217739004Non-ducted, 2.5–3 tons53.7
4OS-RMS27-230VOOLMO · SIERRA2.5 tons27,000 Btu/h · Non-ducted100%1.8010.027,00023.0CEE 25CEE 26XcelES CC1217739002Non-ducted, 2.5–3 tons50.2
5OS-SR24-230VOOLMOwith ductless indoor unit OS-A24SRW-230VI2 tons24,000 Btu/h · Non-ducted76%1.989.018,20019.5CEE 25CEE 26Xcel2218752476Non-ducted, 2 tons38.8

All-around best

Top 5 OLMO 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
1OS-RMS18-230VOOLMO · SIERRA1.5 tons18,000 Btu/h · Non-ducted100%1.9910.022.013.3CEE 25CEE 26XcelES CC1217739001Non-ducted, up to 1.5 tons69.269.568.969.5
2OS-RMS27-230VOOLMO · SIERRA2.5 tons27,000 Btu/h · Non-ducted100%1.8010.023.012.9CEE 25CEE 26XcelES CC1217739002Non-ducted, 2.5–3 tons64.250.278.250.2
3OS-RMS36-230VOOLMO · SIERRA3 tons36,000 Btu/h · Non-ducted100%1.9010.022.012.9CEE 25CEE 26XcelES CC1217739004Non-ducted, 2.5–3 tons61.753.769.753.7
4OS-SR09-230VOOLMO · SIERRAwith ductless indoor unit OS-09SRW-230VI1 ton9,000 Btu/h · Non-ducted63%2.109.523.013.0CEE 25CEE 262215887335Non-ducted, up to 1.5 tons56.745.468.1Not a pick
5OS-SR18-230VOOLMO · SIERRAwith ductless indoor unit OS-18SRW-230VI1.5 tons18,000 Btu/h · Non-ducted76%2.499.821.012.0CEE 25CEE 26Xcel2215887337Non-ducted, up to 1.5 tons55.369.041.669.0

Best model on each rating

OLMO’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FOS-SR18-230VO2.53Non-ducted, up to 1.5 tons100%218752475
Capacity retention at 5°FOS-RMS18-230VO100%Non-ducted, up to 1.5 tons87%217739001
HSPF2OS-RMS18-230VO10.0Non-ducted, up to 1.5 tons64%217739001
SEER2OS-RMS27-230VO23.0Non-ducted, 2.5–3 tons75%217739002
EER2OS-RMS27-230VO12.9Non-ducted, 2.5–3 tons80%217739002
Heating capacity at 5°FOS-RMS18-230VO18,000 Btu/hNon-ducted, up to 1.5 tons93%217739001

All 11 OLMO models in Explore

OLMO 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.
OLMO: 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 tons69.5(50 is the typical model of its size class)OS-RMS18-230VO2 of 6 models qualify · AHRI 21773900169.2(50 is the typical model of its size class)OS-RMS18-230VO6 of 6 models have all five ratings · AHRI 217739001
Non-ducted, 2 tons38.8(50 is the typical model of its size class)OS-SR24-230VOwith ductless indoor unit OS-A24SRW-230VI1 of 1 models qualify · AHRI 21875247634.1(50 is the typical model of its size class)OS-SR24-230VOwith ductless indoor unit OS-A24SRW-230VI1 of 1 models have all five ratings · AHRI 218752476
Non-ducted, 2.5–3 tons53.7(50 is the typical model of its size class)OS-RMS36-230VO2 of 3 models qualify · AHRI 21773900464.2(50 is the typical model of its size class)OS-RMS27-230VO3 of 3 models have all five ratings · AHRI 217739002
Non-ducted, 3.5–4.5 tons16.4(50 is the typical model of its size class)OS-RMS42-230VO1 of 1 models qualify · AHRI 21773900343.7(50 is the typical model of its size class)OS-RMS42-230VO1 of 1 models have all five ratings · AHRI 217739003

All-around board, every manufacturer

Newest OLMO certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified OLMO outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
OS-SR24-230VOOLMOwith ductless indoor unit OS-A24SRW-230VI2 tons24,000 Btu/h · Non-ducted1.9876%9.019.5CEE 25CEE 26Xcel2218752476
OS-SR18-230VOOLMO · SIERRAwith ductless indoor unit OS-A18SRW-230VI1.5 tons18,000 Btu/h · Non-ducted2.5374%9.820.0CEE 25CEE 26Xcel2218752475
OS-SR12-230VOOLMOwith ductless indoor unit OS-A12SRW-230VI1 ton12,000 Btu/h · Non-ducted1.8363%9.020.0CEE 25CEE 262218752474
OS-SR09-230VOOLMO · SIERRAwith ductless indoor unit OS-A09SRW-230VI1 ton9,000 Btu/h · Non-ducted2.1160%9.022.5CEE 25CEE 262218752473
OS-SR12-115VOOLMOwith ductless indoor unit OS-A12SRW-115VI1 ton12,000 Btu/h · Non-ducted1.9051%8.020.0CEE 252218752472

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