The Della Optima Pro CloudAir 12,000 BTU 230V is the better DIY mini-split overall, rated 4.5 to 3.8. The Della Optima Pro CloudAir 12,000 BTU 230V leads on value, efficiency and cold weather. The MrCool DIY Hyper Heat 5th Gen 12,000 BTU 230V wins on noise. The Della Optima Pro CloudAir 12,000 BTU 230V costs $1,282.04 less ($1,249.96 vs $2,532).
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 $1,249.96 Della $1,249.96For cold-climate homes where a quick-connect install matters more than price: it holds its full heat far colder than other quick-connect units. Flare-connect units match its cold-weather output for much less.
Amazon $2,532 MRCOOL DIY Direct $2,557Prices 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 12,000 BTU DIY mini-split; a clear win is highlighted. How we rank explains each one.
| Factor weight | Della Optima Pro CloudAir 12,000 BTU 230V | MrCool DIY Hyper Heat 5th Gen 12,000 BTU 230V |
|---|---|---|
| Overall rating | 4.5/5 | 3.8/5 |
| Value 35% | 98 $104 per 1,000 Btu/h of heat at 5 °F | 48 $230 per 1,000 Btu/h of heat at 5 °F |
| Cold weather 25% | 100 keeps 100% of its heat at 5 °F, heats down to -22 °F | 90 keeps 92% of its heat at 5 °F, heats down to -22 °F |
| Efficiency 20% | 70 10.5 HSPF2, 25 SEER2, COP 1.80 at 5 °F | 57 10 HSPF2, 23.5 SEER2, COP 1.80 at 5 °F |
| Warranty 15% | 70 lifetime parts once registered, no compressor term stated | 64 7-year compressor, 5-year parts |
| Noise 5% | 48 indoor unit from 30 dB(A) | 100 indoor unit from 18 dB(A) |
| Della Optima Pro CloudAir 12,000 BTU 230V | MrCool DIY Hyper Heat 5th Gen 12,000 BTU 230V | |
|---|---|---|
| Capacity (certified) | ||
| Size (nominal) | 12,000 BTU | 12,000 BTU |
| Cooling at 95 °F | 12,000 Btu/h | 12,000 Btu/h |
| Heating at 47 °F | 12,000 Btu/h | 12,000 Btu/h |
| Heating at 17 °F (max) | 14,000 Btu/h | 12,500 Btu/h |
| Heating at 5 °F (max) | 12,000 Btu/h | 11,000 Btu/h |
| Heat kept at 5 °F | 100% | 92% |
| Price per 1,000 Btu/h at 5 °F | $104 | $230 |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 10.5 | 10 |
| SEER2 | 25 | 23.5 |
| EER2 | 14 | 12.8 |
| COP at 5 °F | 1.80 | 1.80 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 218471003 | 216032549 |
| Operating range | ||
| Heats down to | -22 °F | -22 °F |
| Cooling range | 5 to 131 °F | -22 to 122 °F |
| Installation | ||
| Line set connection | Flare fittings (vacuum pump needed) | Quick-connect (no vacuum pump) |
| Line set | 16.4 ft included, up to 49 ft | 25 ft included, up to 75 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-454B | R-454B |
| Indoor unit | 048-TPH-12K2V-C-IN | DIY-12-HP-WMAH-230D25-O |
| Outdoor unit | 048-TPH-12K2V-25S-OUT | DIYHH-12-HP-C-230D25-O |
| Build | ||
| Indoor noise | 30–46 dB(A) | 18–45.5 dB(A) |
| Outdoor noise | 57 dB(A) | 56.5 dB(A) |
| Wi-Fi | Built in | Built in |
| Room size (maker) | up to 550 sq ft | up to 550 sq ft |
| Weight | indoor 23.1 lb / outdoor 69.4 lb | indoor 24.5 lb / outdoor 72.3 lb |
| Warranty | lifetime parts (registered) | 7 yr compressor, 5 yr parts |
| Warranty with DIY install | Yes | Yes |
| Released | 2026-05 | - |
