Pioneer YN018GLSI24RPG: certified ratings
Cooling 16,000–18,000 BTU/h · SEER2 up to 23 · HSPF2 up to 10 · up to 73% of 47°F heating capacity at 5°F · Cold climate: Yes
This outdoor unit has 4 certified indoor pairings, so it is likely a multi-zone or multi-indoor-option unit; ratings differ by pairing. Series: Diamante Ultra. Refrigerant: R-454B. Compressor: continuously variable (inverter), per ENERGY STAR.
All certified pairings (highest HSPF2 first)
| Indoor unit | Series | Cooling BTU/h | SEER2 | EER2 | HSPF2 | Heat 47°F | Heat 17°F | Heat 5°F | % of 47°F cap. at 5°F | COP 5°F | Cold climate | Refrigerant | AHRI ref. | ENERGY STAR record |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WT018GLSI24HLG | Diamante Ultra | 18,000 | 23 | 12.5 | 10 | 19,000 | 15,000 | 13,600 | 72% | 1.8 | Yes | R-454B (GWP:470 | Lower GWP) | 217048752 | 3999467 |
| Diamante Ultra | 17,000 | 20.3 | 11 | 10 | 18,000 | 14,500 | 13,200 | 73% | 1.8 | Yes | R-454B (GWP:470 | Lower GWP) | 217048764 | 3999479 | |
| UT018GLSILCFHG | Diamante Ultra | 18,000 | 20.5 | 11.7 | 9 | 18,000 | 14,500 | 13,200 | 73% | 1.85 | Yes | R-454B (GWP:470 | Lower GWP) | 217048766 | 3999481 |
| CT018GLSILCFHG | Diamante Ultra | 16,000 | 20.5 | 11 | 8.5 | 18,000 | 14,500 | 13,200 | 73% | 1.8 | Yes | R-454B (GWP:470 | Lower GWP) | 217048760 | 3999475 |
"% of 47°F capacity at 5°F" = heating capacity at 5°F ÷ heating capacity at 47°F, both from the ENERGY STAR record (ENERGY STAR's cold-climate designation requires ≥70% and COP ≥1.75 at 5°F; criteria).
Rough running-cost yardstick (top-rated pairing)
| kWh per 1,000 full-load hours | Cost at U.S. avg rate | |
|---|---|---|
| Cooling (18,000 BTU/h ÷ SEER2 23) | 783 | $143 |
| Heating (19,000 BTU/h ÷ HSPF2 10) | 1,900 | $348 |
Cost estimates: cooling kWh ≈ cooling capacity × full-load hours ÷ SEER2 ÷ 1,000; heating kWh ≈ 47°F heating capacity × full-load hours ÷ HSPF2 ÷ 1,000. "Per 1,000 full-load hours" is a yardstick for comparing systems, not a prediction of your bill; your hours depend on climate, house and settings. Rate: U.S. average residential 18.31¢/kWh (EIA, July 2026 (preliminary)).
Estimate with your own hours and rate · Compare with another system
Similar-capacity single-zone units from other DIY brands
No single-zone DIY-brand unit in the same capacity class.
See Pioneer on the manufacturer's site (plain link, not an affiliate link)
We have not tested or installed this equipment. Data gaps: price, sound level, line-set length, warranty and installation requirements are not in ENERGY STAR data. Confirm the AHRI reference number on your quote matches a certified pairing.