Heat pump model numbers starting WO

23 certified units whose model number starts WO, out of every unit in the A to Z. Updated Oct 17, 2026.

One row per certified model number. All 23 in this group are listed; nothing is held back for a second page.

Model numbers starting WO
Model number	Type	Size class	Brands	Certified pairings
WOM-18HH3/230	mini-split	18,000 Btu (1.5-ton)	1	3
WOM-18RH3/230	mini-split	18,000 Btu (1.5-ton)	1	3
WOM-27HH4/230	mini-split	30,000 Btu (2.5-ton)	1	3
WOM-27RH4/230	mini-split	24,000 Btu (2-ton)	1	3
WOM-36HH5/230	mini-split	36,000 Btu (3-ton)	1	3
WOM-36RH5/230	mini-split	36,000 Btu (3-ton)	1	3
WOM-48HH6/230	mini-split	48,000 Btu (4-ton)	1	3
WOM-48RH6/230	mini-split	42,000 Btu (3.5-ton)	1	3
WOM-60HH6/230	mini-split	54,000 Btu (4.5-ton)	1	3
WOS-06PRE/230	mini-split	6,000 Btu	1	3
WOS-09ECO/230	mini-split	9,000 Btu	1	1
WOS-09PRE/230	mini-split	9,000 Btu	1	6
WOS-09QUA/115	mini-split	9,000 Btu	1	1
WOS-09QUA/230	mini-split	9,000 Btu	1	6
WOS-12PRE/230	mini-split	12,000 Btu (1-ton)	1	6
WOS-12QUA/115	mini-split	12,000 Btu (1-ton)	1	1
WOS-12QUA/230	mini-split	12,000 Btu (1-ton)	1	6
WOS-18PRE/230	mini-split	18,000 Btu (1.5-ton)	1	9
WOS-18QUA/230	mini-split	18,000 Btu (1.5-ton)	1	8
WOS-24ECO/230	mini-split	24,000 Btu (2-ton)	1	1
WOS-24PRE/230	mini-split	24,000 Btu (2-ton)	1	5
WOS-24QUA/230	mini-split	24,000 Btu (2-ton)	1	5
WOS-33PRE/230	central	30,000 Btu (2.5-ton)	1	2

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