Heat pump model numbers starting FS
8 certified units whose model number starts FS, out of every unit in the A to Z. Updated Oct 17, 2026.
The units
One row per certified model number. All 8 in this group are listed; nothing is held back for a second page.
| Model number | Type | Size class | Brands | Certified pairings |
|---|---|---|---|---|
| FSH3BF4M2SX36K | central | 36,000 Btu (3-ton) | 2 | 2 |
| FSH4BF5M2SX24K | central | 24,000 Btu (2-ton) | 2 | 4 |
| FSH4BF5M2SX36K | central | 36,000 Btu (3-ton) | 2 | 2 |
| FSH4BF5M2SX48K | central | 48,000 Btu (4-ton) | 2 | 6 |
| FSHSR09B1B | mini-split | 9,000 Btu | 1 | 1 |
| FSHSR09B1C | mini-split | 9,000 Btu | 3 | 4 |
| FSHSR18B3B | mini-split | 18,000 Btu (1.5-ton) | 1 | 1 |
| FSHSR18B3D | mini-split | 18,000 Btu (1.5-ton) | 3 | 4 |
Other groups
Every model number group, A to Z
Find a model by its number, its indoor unit, or its AHRI number