Heat pump model numbers starting O-

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

One row per certified model number. All 30 in this group are listed; nothing is held back for a second page.

Model numbers starting O-
Model number	Type	Size class	Brands	Certified pairings
O-AYC24SD-1	central	24,000 Btu (2-ton)	1	1
O-AYC48SD-1	central	48,000 Btu (4-ton)	1	1
O-AYD09SD-1	mini-split	9,000 Btu	1	1
O-AYD12SD-1	mini-split	12,000 Btu (1-ton)	1	1
O-AYD18SD-1	mini-split	18,000 Btu (1.5-ton)	1	1
O-AYD18SD-2	mini-split	18,000 Btu (1.5-ton)	1	1
O-AYD24SD-1	mini-split	24,000 Btu (2-ton)	1	1
O-AYD24SD-3	mini-split	24,000 Btu (2-ton)	1	1
O-AYD36SD-4	mini-split	30,000 Btu (2.5-ton)	1	1
O-AYD42SD-5	mini-split	42,000 Btu (3.5-ton)	1	1
O-ES-09-HP-C-230B	mini-split	9,000 Btu	1	1
O-ES-09-HP-C-230C-O1	mini-split	9,000 Btu	1	3
O-ES-12-HP-C-230B	mini-split	12,000 Btu (1-ton)	1	1
O-ES-12-HP-C-230C-O1	mini-split	12,000 Btu (1-ton)	1	3
O-ES-18-HP-C-230B	mini-split	18,000 Btu (1.5-ton)	1	1
O-ES-18-HP-C-230C-O1	mini-split	18,000 Btu (1.5-ton)	1	1
O-ES-24-HP-C-230B	mini-split	24,000 Btu (2-ton)	1	1
O-ES-24-HP-C-230C-O1	mini-split	24,000 Btu (2-ton)	1	1
O-HH-09-HP-C-230A	mini-split	9,000 Btu	1	2
O-HH-09-HP-C-230B	mini-split	9,000 Btu	1	2
O-HH-09-HP-C-230C-O	mini-split	9,000 Btu	1	3
O-HH-12-HP-C-230A	mini-split	12,000 Btu (1-ton)	1	2
O-HH-12-HP-C-230B	mini-split	12,000 Btu (1-ton)	1	1
O-HH-12-HP-C-230C-O	mini-split	12,000 Btu (1-ton)	1	3
O-HH-18-HP-C-230A	mini-split	18,000 Btu (1.5-ton)	1	2
O-HH-18-HP-C-230B	mini-split	18,000 Btu (1.5-ton)	1	1
O-HH-18-HP-C-230C-O	mini-split	18,000 Btu (1.5-ton)	1	3
O-HH-24-HP-C-230A	mini-split	24,000 Btu (2-ton)	1	2
O-HH-24-HP-C-230B	mini-split	24,000 Btu (2-ton)	1	2
O-HH-24-HP-C-230C-O	mini-split	24,000 Btu (2-ton)	1	3

Other groups