Heat pump model numbers starting WH
17 certified units whose model number starts WH, out of every unit in the A to Z. Updated Oct 17, 2026.
The units
One row per certified model number. All 17 in this group are listed; nothing is held back for a second page.
| Model number | Type | Size class | Brands | Certified pairings |
|---|---|---|---|---|
| WHM48SZA21S | central | 42,000 Btu (3.5-ton) | 1 | 1 |
| WHP09SZA21S | mini-split | 9,000 Btu | 1 | 1 |
| WHP18M2A21S | mini-split | 18,000 Btu (1.5-ton) | 1 | 2 |
| WHP18SZA21S | mini-split | 18,000 Btu (1.5-ton) | 1 | 1 |
| WHP24M3A21S | mini-split | 24,000 Btu (2-ton) | 1 | 2 |
| WHP24SZA21S | mini-split | 24,000 Btu (2-ton) | 1 | 1 |
| WHP36M4A21S | mini-split | 30,000 Btu (2.5-ton) | 1 | 2 |
| WHP42M5A21S | mini-split | 42,000 Btu (3.5-ton) | 1 | 2 |
| WHS09SZB21S | mini-split | 9,000 Btu | 1 | 1 |
| WHS18SZB21S | mini-split | 18,000 Btu (1.5-ton) | 1 | 1 |
| WHS30SZB21S | mini-split | 30,000 Btu (2.5-ton) | 1 | 1 |
| WHU09SZA21S | mini-split | 9,000 Btu | 1 | 2 |
| WHU12SZA21S | mini-split | 12,000 Btu (1-ton) | 1 | 1 |
| WHU18SZA21S | mini-split | 18,000 Btu (1.5-ton) | 1 | 1 |
| WHU24SZA21S | mini-split | 24,000 Btu (2-ton) | 1 | 1 |
| WHZ09SZA21S | mini-split | 9,000 Btu | 1 | 1 |
| WHZ12SZA21S | mini-split | 12,000 Btu (1-ton) | 1 | 1 |
Other groups
Every model number group, A to Z
Find a model by its number, its indoor unit, or its AHRI number