The Della Optima Pro CloudAir 9,000 BTU 230V is the better DIY mini-split overall, rated 4.5 to 3.7. The Della Optima Pro CloudAir 9,000 BTU 230V leads on cold weather, value and efficiency. The Della Optima Pro CloudAir 9,000 BTU 230V costs $38.04 less ($1,049.96 vs $1,088).
The best value for heating through a cold winter, if you can pull a vacuum yourself or pay someone to. It holds its full rated heat at 5 °F for far less than a quick-connect unit that does the same.
Amazon $1,049.96 Della $1,049.96A 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 $1,088Prices were last checked October 21, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Each factor is scored 0-100 against the same fixed reference points for every 9,000 BTU DIY mini-split; a clear win is highlighted. How we rank explains each one.
| Factor weight | Della Optima Pro CloudAir 9,000 BTU 230V | Pioneer Quantum Ultra 9,000 BTU 115V |
|---|---|---|
| Overall rating | 4.5/5 | 3.7/5 |
| Value 35% | 94 $115 per 1,000 Btu/h of heat at 5 °F | 82 $145 per 1,000 Btu/h of heat at 5 °F |
| Cold weather 25% | 100 keeps 101% of its heat at 5 °F, heats down to -22 °F | 57 keeps 75% of its heat at 5 °F, heats down to -13 °F |
| Efficiency 20% | 70 10.5 HSPF2, 25 SEER2, COP 1.80 at 5 °F | 51 9.5 HSPF2, 23 SEER2, COP 1.89 at 5 °F |
| Warranty 15% | 70 lifetime parts once registered, no compressor term stated | 49 5-year compressor, 5-year parts, for a DIY install |
| Noise 5% | 67 indoor unit from 26 dB(A) | 48 indoor unit from 30 dB(A) |
| Della Optima Pro CloudAir 9,000 BTU 230V | Pioneer Quantum Ultra 9,000 BTU 115V | |
|---|---|---|
| Capacity (certified) | ||
| Size (nominal) | 9,000 BTU | 9,000 BTU |
| Cooling at 95 °F | 9,000 Btu/h | 9,000 Btu/h |
| Heating at 47 °F | 9,000 Btu/h | 10,000 Btu/h |
| Heating at 17 °F (max) | 10,000 Btu/h | 9,100 Btu/h |
| Heating at 5 °F (max) | 9,100 Btu/h | 7,500 Btu/h |
| Heat kept at 5 °F | 101% | 75% |
| Price per 1,000 Btu/h at 5 °F | $115 | $145 |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 10.5 | 9.5 |
| SEER2 | 25 | 23 |
| EER2 | 14.5 | 13 |
| COP at 5 °F | 1.80 | 1.89 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 218471006 | 217048748 |
| Operating range | ||
| Heats down to | -22 °F | -13 °F |
| Cooling range | 5 to 131 °F | 5 to 131 °F |
| Installation | ||
| Line set connection | Flare fittings (vacuum pump needed) | Flare fittings (vacuum pump needed) |
| Line set | 16.4 ft included, up to 49 ft | 16 ft included, up to 50 ft |
| Voltage | 230 V | 115 V |
| Refrigerant | R-454B | R-454B |
| Indoor unit | 048-TPH-9K2V-C-IN | WT009ALSI24HLG |
| Outdoor unit | 048-TPH-9K2V-25S-OUT | YN009ALSI24RPG |
| Build | ||
| Indoor noise | 26–42 dB(A) | 30–43 dB(A) |
| Outdoor noise | 55 dB(A) | 50 dB(A) |
| Wi-Fi | Built in | Built in |
| Room size (maker) | up to 400 sq ft | up to 350 sq ft |
| Weight | indoor 20.7 lb / outdoor 54 lb | indoor 20.7 lb / outdoor 53.6 lb |
| Warranty | lifetime parts (registered) | 10 yr compressor, 7 yr parts |
| Warranty with DIY install | Yes | Yes |
| DIY install warranty | - | 5 yr compressor, 5 yr parts |
| Released | 2026-05 | 2025-06 |
