Heat pump model numbers starting A4
5 certified units whose model number starts A4, 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 |
|---|---|---|---|---|
| A4MO21-27N2-M1 | mini-split | 24,000 Btu (2-ton) | 1 | 3 |
| A4MO21-36N1-M1 | mini-split | 36,000 Btu (3-ton) | 1 | 1 |
| A4MO22-36N1-M1H | mini-split | 36,000 Btu (3-ton) | 1 | 3 |
| A4MO23-27N2-M1H | mini-split | 30,000 Btu (2.5-ton) | 1 | 3 |
| A4OG-36HFN1-M | mini-split | 36,000 Btu (3-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