WHU18SZA21S
Westinghouse · mini-split heat pump
WHU18SZA21S is in the certified data as of Sep 19, 2026. WHU18SZA21S changed its certified heat output at 47°F on AHRI certificate 207237537 from 18,800 Btu/h to 18,000 Btu/h in the certified data between August 2025 and September 2026.
- 18,000 Btu (1.5-ton)
- Mini-split
This unit's certified figures are identical to FPHFR18A3A (Friedrich). See the full figures, the performance chart, and a comparison with other units here:
FPHFR18A3A (main listing for WHU18SZA21S)
Certified pairings and AHRI numbers
1 certified pairing · 1 indoor unit
| AHRI certificate | Indoor unit | Furnace | Certified | At 5°FBtu/h | At 47°FBtu/h | At 95°FBtu/h · cooling |
|---|---|---|---|---|---|---|
| 207237537 | WHU18CTA21S | No furnace | Jun 9, 2026 | 13,200 | 18,000 | 18,000 |
Brands listing this model number
Product history
- WHU18SZA21S changed its certified heat output at 47°F on AHRI certificate 207237537 from 18,800 Btu/h to 18,000 Btu/h in the certified data between August 2025 and September 2026.
- WHU18SZA21S was in the certified data by September 2024.