A low price for a self-installer who owns or will rent a vacuum pump. The Klimaire DIY is the same certified system with quick-connect lines, and Della’s Optima has near-identical ratings for less.
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
| Capacity (certified) | |
|---|---|
| Size (nominal) | 9,000 BTU |
| Cooling at 95 °F | 9,000 Btu/h |
| Heating at 47 °F | 10,000 Btu/h |
| Heating at 17 °F (max) | 9,100 Btu/h |
| Heating at 5 °F (max) | 7,100 Btu/h |
| Heat kept at 5 °F | 71% |
| Price per 1,000 Btu/h at 5 °F | $149 |
| Efficiency (certified) | |
| HSPF2 (Region IV) | 9.5 |
| SEER2 | 23 |
| EER2 | 13 |
| COP at 5 °F | 1.84 |
| ENERGY STAR | ENERGY STAR Cold Climate |
| AHRI certificate | 217048749 |
| Operating range | |
| Heats down to | -13 °F |
| Cooling range | 5 to 131 °F |
| Installation | |
| Line set connection | Flare fittings (vacuum pump needed) |
| Line set | 16 ft included, up to 50 ft |
| Voltage | 230 V |
| Refrigerant | R-454B |
| Indoor unit | WT009GLSI24HLG |
| Outdoor unit | YN009GLSI24RPG |
| Build | |
| Indoor noise | 30–43 dB(A) |
| Outdoor noise | 50 dB(A) |
| Wi-Fi | Built in |
| Room size (maker) | up to 350 sq ft |
| Weight | indoor 20.7 lb / outdoor 52.7 lb |
| Warranty | 10 yr compressor, 7 yr parts |
| Warranty with DIY install | Yes |
| DIY install warranty | 5 yr compressor, 5 yr parts |
| Released | 2025-06 |
The best-value quick-connect line: the same certified system as Pioneer’s Quantum Ultra, close to Della’s Optima, without the vacuum pump, for the same price or a few hundred dollars more.
Amazon $1,099A low price for a self-installer who owns or will rent a vacuum pump. The Klimaire DIY is the same certified system with quick-connect lines, and Della’s Optima has near-identical ratings for less.
Amazon $1,088 Pioneer Mini Split store $1,088A quick-connect unit with one of the longest warranties for a self-install, priced below MrCool’s DIY 5th Gen. Its −4 °F heating limit rules it out as the only heat in a very cold climate.
AmazonCompare the Pioneer Quantum Ultra 9,000 BTU 230V with any other DIY mini-split →
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