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Heat pump model numbers starting OA

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

One row per certified model number. All 36 in this group are listed; nothing is held back for a second page.

Model numbers starting OA
Model number Type Size class Brands Certified pairings
OAH-AHU18K-CH-O central 18,000 Btu (1.5-ton) 1 1
OAH-AHU24K-CH-O central 24,000 Btu (2-ton) 1 1
OAH-AHU30K-CH-O central 30,000 Btu (2.5-ton) 1 1
OAH-AHU36K-CH-O central 36,000 Btu (3-ton) 1 1
OAH-AHU48K-CH-O central 48,000 Btu (4-ton) 1 1
OAH-AHU60K-CH-O central 54,000 Btu (4.5-ton) 1 1
OAH-MZ18K-208-CH-O mini-split 18,000 Btu (1.5-ton) 1 1
OAH-MZ18K-208-PR-O mini-split 18,000 Btu (1.5-ton) 1 1
OAH-MZ24K-208-CH-O mini-split 24,000 Btu (2-ton) 1 1
OAH-MZ24K-208-PR-O mini-split 24,000 Btu (2-ton) 1 1
OAH-MZ36K-208-CH-O mini-split 36,000 Btu (3-ton) 1 1
OAH-MZ36K-208-PR-O mini-split 36,000 Btu (3-ton) 1 1
OAH-MZ42K-208-CH-O mini-split 42,000 Btu (3.5-ton) 1 1
OAH-MZ42K-208-PR-O mini-split 36,000 Btu (3-ton) 1 1
OAH-SZ12K-115-PR-O mini-split 12,000 Btu (1-ton) 1 1
OAH-SZ12K-208-PR-O mini-split 12,000 Btu (1-ton) 1 1
OAH-SZ18K-208-PR-O mini-split 18,000 Btu (1.5-ton) 1 1
OAH-SZ24K-208-PR-O mini-split 24,000 Btu (2-ton) 1 1
OAH09H/O4S4P mini-split 9,000 Btu 1 3
OAH09H/O6S4P mini-split 9,000 Btu 1 5
OAH12H/O4S4P mini-split 12,000 Btu (1-ton) 1 4
OAH12H/O6S4P mini-split 12,000 Btu (1-ton) 1 6
OAH18H/O4S4P mini-split 18,000 Btu (1.5-ton) 1 4
OAH18H/O6S4P mini-split 18,000 Btu (1.5-ton) 1 7
OAH24H/O4S4P mini-split 24,000 Btu (2-ton) 1 4
OAH24H/O6S4P mini-split 24,000 Btu (2-ton) 1 4
OAH30H/O6S4P mini-split 30,000 Btu (2.5-ton) 1 1
OAH36H/O4S41P mini-split 36,000 Btu (3-ton) 1 3
OAH36H/O6S4P mini-split 36,000 Btu (3-ton) 1 3
OAH48H/O4S41P mini-split 48,000 Btu (4-ton) 1 2
OAH48H/O6S4P mini-split 48,000 Btu (4-ton) 1 3
OAH60H/O6S4P mini-split 54,000 Btu (4.5-ton) 1 2
OARX-H09A-O mini-split 9,000 Btu 1 3
OARX-H12A-O mini-split 12,000 Btu (1-ton) 1 1
OARX-H18A-O mini-split 18,000 Btu (1.5-ton) 1 1
OARX-H24A-O mini-split 24,000 Btu (2-ton) 1 1

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