The Della Optima Pro CloudAir 24,000 BTU 230V rates 4.1 among 24,000 BTU DIY mini-splits; the MrCool DIY 5th Gen 36,000 BTU 230V rates 2.9 among 36,000 BTU ones. The Della Optima Pro CloudAir 24,000 BTU 230V costs $1,320.03 less ($2,249.96 vs $3,569.99).
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 $2,249.96 Della $2,249.96The pricier of the two 36,000 BTU quick-connect units, with a better heating limit and quieter indoor unit than the Klimaire. Neither keeps much of its heat in deep cold.
Amazon $3,569.99 MRCOOL DIY Direct $3,790Prices 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.
These two sit in different size classes (24,000 BTU and 36,000 BTU), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Della Optima Pro CloudAir 24,000 BTU 230V | MrCool DIY 5th Gen 36,000 BTU 230V |
|---|---|---|
| Overall rating | 4.1/5 | 2.9/5 |
| Value 35% | 83 $100 per 1,000 Btu/h of heat at 5 °F | 42 $162 per 1,000 Btu/h of heat at 5 °F |
| Cold weather 25% | 92 keeps 93% of its heat at 5 °F, heats down to -22 °F | 40 keeps 61% of its heat at 5 °F, heats down to -13 °F |
| Efficiency 20% | 54 10 HSPF2, 22.5 SEER2, COP 1.80 at 5 °F | 21 8.5 HSPF2, 18 SEER2, COP 1.97 at 5 °F |
| Warranty 15% | 70 lifetime parts once registered, no compressor term stated | 64 7-year compressor, 5-year parts |
| Noise 5% | 38 indoor unit from 32 dB(A) | 60 indoor unit from 27.5 dB(A) |
| Della Optima Pro CloudAir 24,000 BTU 230V | MrCool DIY 5th Gen 36,000 BTU 230V | |
|---|---|---|
| Capacity (certified) | ||
| Size (nominal) | 24,000 BTU | 36,000 BTU |
| Cooling at 95 °F | 24,000 Btu/h | 36,000 Btu/h |
| Heating at 47 °F | 24,000 Btu/h | 36,000 Btu/h |
| Heating at 17 °F (max) | 24,000 Btu/h | 26,300 Btu/h |
| Heating at 5 °F (max) | 22,400 Btu/h | 22,000 Btu/h |
| Heat kept at 5 °F | 93% | 61% |
| Price per 1,000 Btu/h at 5 °F | $100 | $162 |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 10 | 8.5 |
| SEER2 | 22.5 | 18 |
| EER2 | 11.7 | 8.5 |
| COP at 5 °F | 1.80 | 1.97 |
| ENERGY STAR | ENERGY STAR Cold Climate | Not ENERGY STAR |
| AHRI certificate | 218471005 | 216032548 |
| Operating range | ||
| Heats down to | -22 °F | -13 °F |
| Cooling range | 5 to 131 °F | -13 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 65 ft | 25 ft included, up to 75 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-454B | R-454B |
| Indoor unit | 048-TPH-24K2V-C-IN | DIY-36-HP-WMAH-230D25-O |
| Outdoor unit | 048-TPH-24K2V-23S-OUT | DIY-36-HP-C-230D25-O |
| Build | ||
| Indoor noise | 32–49 dB(A) | 27.5–55.5 dB(A) |
| Outdoor noise | 61 dB(A) | 60.5 dB(A) |
| Wi-Fi | Built in | Built in |
| Room size (maker) | up to 1,500 sq ft | up to 1,550 sq ft |
| Weight | indoor 30.9 lb / outdoor 108 lb | indoor 48.7 lb / outdoor 152.1 lb |
| Warranty | lifetime parts (registered) | 7 yr compressor, 5 yr parts |
| Warranty with DIY install | Yes | Yes |
| Released | 2026-05 | - |
