Heat pump model numbers starting AT

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

One row per certified model number. All 19 in this group are listed; nothing is held back for a second page.

Model numbers starting AT
Model number	Type	Size class	Brands	Certified pairings
AT2239	central	12,000 Btu (1-ton)	1	1
AT2239 CA	central	12,000 Btu (1-ton)	1	1
AT2240	central	18,000 Btu (1.5-ton)	1	1
AT2240 CA	central	18,000 Btu (1.5-ton)	1	1
ATCB12K454B-O	mini-split	12,000 Btu (1-ton)	1	2
ATCB18K454B-O	mini-split	18,000 Btu (1.5-ton)	1	2
ATCB24K454B-O	mini-split	24,000 Btu (2-ton)	1	2
ATPRO23-09H1B	mini-split	9,000 Btu	1	1
ATPRO23-09H220V1B	mini-split	9,000 Btu	1	1
ATPRO23-12H1B	mini-split	12,000 Btu (1-ton)	1	1
ATPRO23-12H220V1B	mini-split	12,000 Btu (1-ton)	1	1
ATPRO23-18H1B	mini-split	18,000 Btu (1.5-ton)	1	1
ATPRO23-24H1B	mini-split	24,000 Btu (2-ton)	1	1
ATPRO24-09H1B	mini-split	9,000 Btu	2	2
ATPRO24-09H220V1B	mini-split	9,000 Btu	2	2
ATPRO24-12H1B	mini-split	12,000 Btu (1-ton)	2	2
ATPRO24-12H220V1B	mini-split	12,000 Btu (1-ton)	2	2
ATPRO24-18H1B	mini-split	18,000 Btu (1.5-ton)	2	2
ATPRO24-24H1B	mini-split	24,000 Btu (2-ton)	2	2

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