Heat pump model numbers starting Z4
12 certified units whose model number starts Z4, out of every unit in the A to Z. Updated Oct 17, 2026.
The units
One row per certified model number. All 12 in this group are listed; nothing is held back for a second page.
| Model number | Type | Size class | Brands | Certified pairings |
|---|---|---|---|---|
| Z4SOV-18HDMB-US | mini-split | 18,000 Btu (1.5-ton) | 1 | 3 |
| Z4SOV-18HDMB-USHH | mini-split | 18,000 Btu (1.5-ton) | 1 | 3 |
| Z4SOV-27HDMB-US | mini-split | 24,000 Btu (2-ton) | 1 | 3 |
| Z4SOV-27HDMB-USHH | mini-split | 30,000 Btu (2.5-ton) | 1 | 3 |
| Z4SOV-36HDM-US | mini-split | 36,000 Btu (3-ton) | 1 | 1 |
| Z4SOV-36HDMB-US | mini-split | 36,000 Btu (3-ton) | 1 | 3 |
| Z4SOV-36HDMB-USHH | mini-split | 36,000 Btu (3-ton) | 1 | 3 |
| Z4SOV-36HDTA-US-O | mini-split | 36,000 Btu (3-ton) | 1 | 1 |
| Z4SOV-36HDTB-US | mini-split | 36,000 Btu (3-ton) | 1 | 2 |
| Z4SOV-48HDMB-US | mini-split | 42,000 Btu (3.5-ton) | 1 | 3 |
| Z4SOV-48HDMB-USHH | mini-split | 48,000 Btu (4-ton) | 1 | 3 |
| Z4SOV-53HDMB-USHH | mini-split | 54,000 Btu (4.5-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