Heat pump model numbers starting A3
5 certified units whose model number starts A3, out of every unit in the A to Z. Updated Oct 17, 2026.
The units
One row per certified model number. All 5 in this group are listed; nothing is held back for a second page.
| Model number | Type | Size class | Brands | Certified pairings |
|---|---|---|---|---|
| A3MO21-18N2-M1 | mini-split | 18,000 Btu (1.5-ton) | 1 | 3 |
| A3MO21-27N1-M1 | mini-split | 30,000 Btu (2.5-ton) | 1 | 3 |
| A3MO22-27N1-M1H | mini-split | 24,000 Btu (2-ton) | 1 | 3 |
| A3MO23-18N2-M1H | mini-split | 18,000 Btu (1.5-ton) | 1 | 3 |
| A3OJ-27HFN1-M | mini-split | 30,000 Btu (2.5-ton) | 1 | 3 |
Other groups
Every model number group, A to Z
Find a model by its number, its indoor unit, or its AHRI number