The Della Optima Pro CloudAir 18,000 BTU 230V is the better DIY mini-split overall, rated 4.3 to 4.1. The Della Optima Pro CloudAir 18,000 BTU 230V leads on cold weather. The Della Optima Pro CloudAir 18,000 BTU 230V costs $131.86 less ($1,849.96 vs $1,981.82).
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 $1,849.96 Della $1,849.96A 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.
Amazon $1,981.82Prices 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 18,000 BTU DIY mini-split; a clear win is highlighted. How we rank explains each one.
| Factor weight | Della Optima Pro CloudAir 18,000 BTU 230V | Perfect Aire 4th Gen Quick Connect 18,000 BTU 230V |
|---|---|---|
| Overall rating | 4.3/5 | 4.1/5 |
| Value 35% | 90 $104 per 1,000 Btu/h of heat at 5 °F | 87 $110 per 1,000 Btu/h of heat at 5 °F |
| Cold weather 25% | 99 keeps 99% of its heat at 5 °F, heats down to -22 °F | 73 keeps 100% of its heat at 5 °F, heats down to -4 °F |
| Efficiency 20% | 57 10 HSPF2, 23.5 SEER2, COP 1.80 at 5 °F | 53 10 HSPF2, 21 SEER2, COP 1.90 at 5 °F |
| Warranty 15% | 70 lifetime parts once registered, no compressor term stated | 78 7-year compressor, 7-year parts |
| Noise 5% | 29 indoor unit from 34 dB(A) | 50 indoor noise not published (neutral score used) |
| Della Optima Pro CloudAir 18,000 BTU 230V | Perfect Aire 4th Gen Quick Connect 18,000 BTU 230V | |
|---|---|---|
| Capacity (certified) | ||
| Size (nominal) | 18,000 BTU | 18,000 BTU |
| Cooling at 95 °F | 18,000 Btu/h | 18,000 Btu/h |
| Heating at 47 °F | 18,000 Btu/h | 18,000 Btu/h |
| Heating at 17 °F (max) | 15,500 Btu/h | 18,500 Btu/h |
| Heating at 5 °F (max) | 17,800 Btu/h | 18,000 Btu/h |
| Heat kept at 5 °F | 99% | 100% |
| Price per 1,000 Btu/h at 5 °F | $104 | $110 |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 10 | 10 |
| SEER2 | 23.5 | 21 |
| EER2 | 12.5 | 12.9 |
| COP at 5 °F | 1.80 | 1.90 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 218471004 | 216498646 |
| Operating range | ||
| Heats down to | -22 °F | -4 °F |
| Cooling range | 5 to 131 °F | 5 to 115 °F |
| Installation | ||
| Line set connection | Flare fittings (vacuum pump needed) | Quick-connect (no vacuum pump) |
| Line set | 16.4 ft included, up to 65 ft | 25 ft included |
| Voltage | 230 V | 230 V |
| Refrigerant | R-454B | R-454B |
| Indoor unit | 048-TPH-18K2V-C-IN | 4PAMSHQCW18 |
| Outdoor unit | 048-TPH-18K2V-23S-OUT | 4PAMSHQCO18 |
| Build | ||
| Indoor noise | 34–48 dB(A) | - |
| Outdoor noise | 58 dB(A) | - |
| Wi-Fi | Built in | Built in |
| Room size (maker) | up to 1,000 sq ft | up to 750 sq ft |
| Weight | indoor 30.9 lb / outdoor 93.7 lb | indoor 33 lb / outdoor 97 lb |
| Warranty | lifetime parts (registered) | 7 yr compressor, 7 yr parts |
| Warranty with DIY install | Yes | Yes |
| Released | 2026-05 | 2025-09 |
