Explore certified heat pump models

Filter every outdoor model in this refrigerant group. Each row’s numbers come from one representative AHRI certification (its best COP at 5°F). Sorting by a rating leaves out models without that rating.

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ExploreData as of Oct 11, 2026updated Oct 11, 2026 · sources

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Duct type: “Ducted (incl. mixed)” lists every model with a ducted or a mixed (multi-zone) certification, since a mixed system can serve ducted heads; “Ductless (incl. mixed)” every model with a ductless or a mixed one. The rankings compare mixed pairings with ductless units. Why

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11 models

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# · Outdoor model	Size · type	COP@5°F	Cap. 5/47	HSPF2	SEER2	EER2	Btu/h @5°F	Meets	Combos	AHRI ref.
1OS-RMS18-230VOOLMO · SIERRA	1.5 tons18,000 Btu/h · Non-ducted	1.99	100%	10.0	22.0	13.3	18,000	CEE 25CEE 26XcelES CC	1	217739001
2OS-RMS27-230VOOLMO · SIERRA	2.5 tons27,000 Btu/h · Non-ducted	1.80	100%	10.0	23.0	12.9	27,000	CEE 25CEE 26XcelES CC	1	217739002
3OS-RMS36-230VOOLMO · SIERRA	3 tons36,000 Btu/h · Non-ducted	1.90	100%	10.0	22.0	12.9	36,000	CEE 25CEE 26XcelES CC	1	217739004
4OS-RMS42-230VOOLMO · SIERRA	3.5 tons42,000 Btu/h · Non-ducted	1.90	75%	9.5	22.0	12.0	36,000	CEE 25CEE 26XcelES CC	1	217739003
5OS-RSR36-230VOOLMOwith ductless indoor unit OS-R36SRW-230VI	3 tons34,600 Btu/h · Non-ducted	1.95	58%	8.4	20.0	9.5	20,000	None	1	217482493
6OS-SR09-115VOOLMO · SIERRAwith ductless indoor unit OS-09SRW-115VI	1 ton9,000 Btu/h · Non-ducted	2.00	63%	9.0	20.0	12.5	6,000	CEE 25CEE 26	2	215887333
7OS-SR09-230VOOLMO · SIERRAwith ductless indoor unit OS-A09SRW-230VI	1 ton9,000 Btu/h · Non-ducted	2.11	60%	9.0	22.5	12.5	5,400	CEE 25CEE 26	2	218752473
8OS-SR12-115VOOLMOwith ductless indoor unit OS-12SRW-115VI	1 ton12,000 Btu/h · Non-ducted	1.90	63%	8.5	18.0	10.2	7,500	CEE 25	2	215887334
9OS-SR12-230VOOLMOwith ductless indoor unit OS-12SRW-230VI	1 ton12,000 Btu/h · Non-ducted	2.00	63%	8.5	20.0	11.1	7,500	CEE 25CEE 26	2	215887336
10OS-SR18-230VOOLMO · SIERRAwith ductless indoor unit OS-A18SRW-230VI	1.5 tons18,000 Btu/h · Non-ducted	2.53	74%	9.8	20.0	12.0	13,400	CEE 25CEE 26Xcel	2	218752475
11OS-SR24-230VOOLMOwith ductless indoor unit OS-A24SRW-230VI	2 tons24,000 Btu/h · Non-ducted	1.98	76%	9.0	19.5	10.6	18,200	CEE 25CEE 26Xcel	2	218752476

Download CSV of the matching modelsAll 11 matching models, every page, in this order.