Heat pump model numbers starting OS
15 certified units whose model number starts OS, out of every unit in the A to Z. Updated Oct 17, 2026.
The units
One row per certified model number. All 15 in this group are listed; nothing is held back for a second page.
| Model number | Type | Size class | Brands | Certified pairings |
|---|---|---|---|---|
| OS-EAH24-230VO | central | 24,000 Btu (2-ton) | 1 | 1 |
| OS-EAH36-230VO | central | 36,000 Btu (3-ton) | 1 | 1 |
| OS-EAH48-230VO | central | 48,000 Btu (4-ton) | 1 | 1 |
| OS-EL09ALP230VO | mini-split | 9,000 Btu | 2 | 2 |
| OS-MSR18-230VO | mini-split | 18,000 Btu (1.5-ton) | 1 | 1 |
| OS-MSR24-230VO | mini-split | 24,000 Btu (2-ton) | 1 | 1 |
| OS-MSR36-230VO | mini-split | 30,000 Btu (2.5-ton) | 1 | 1 |
| OS-MSR42-230VO | mini-split | 42,000 Btu (3.5-ton) | 1 | 1 |
| OS-RMS18-230VO | mini-split | 18,000 Btu (1.5-ton) | 1 | 1 |
| OS-RMS27-230VO | mini-split | 24,000 Btu (2-ton) | 1 | 1 |
| OS-RMS36-230VO | mini-split | 36,000 Btu (3-ton) | 1 | 1 |
| OS-RMS42-230VO | mini-split | 42,000 Btu (3.5-ton) | 1 | 1 |
| OS-SR09-115VO | mini-split | 9,000 Btu | 1 | 1 |
| OS-SR09-230VO | mini-split | 9,000 Btu | 1 | 2 |
| OS-SR18-230VO | mini-split | 18,000 Btu (1.5-ton) | 1 | 2 |
Other groups
Every model number group, A to Z
Find a model by its number, its indoor unit, or its AHRI number