The MrCool DIY Hyper Heat 5th Gen 12,000 BTU 230V is the better DIY mini-split overall, rated 3.8 to 3.6. The MrCool DIY Hyper Heat 5th Gen 12,000 BTU 230V leads on cold weather. The MrCool DIY 5th Gen 12,000 BTU 115V wins on value and efficiency. The MrCool DIY 5th Gen 12,000 BTU 115V costs $773 less ($1,759 vs $2,532).
For 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 $2,557For someone who wants a true plug-together install with no tools beyond a drill, and a warranty that survives it. Expect to pay well over the price of a flare unit with the same cold-weather output.
Amazon $1,759 MRCOOL DIY Direct $2,370Prices 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 | MrCool DIY Hyper Heat 5th Gen 12,000 BTU 230V | MrCool DIY 5th Gen 12,000 BTU 115V |
|---|---|---|
| Overall rating | 3.8/5 | 3.6/5 |
| Value 35% | 48 $230 per 1,000 Btu/h of heat at 5 °F | 56 $209 per 1,000 Btu/h of heat at 5 °F |
| Cold weather 25% | 90 keeps 92% of its heat at 5 °F, heats down to -22 °F | 51 keeps 70% of its heat at 5 °F, heats down to -13 °F |
| Efficiency 20% | 57 10 HSPF2, 23.5 SEER2, COP 1.80 at 5 °F | 71 10.2 HSPF2, 23.5 SEER2, COP 2.09 at 5 °F |
| Warranty 15% | 64 7-year compressor, 5-year parts | 64 7-year compressor, 5-year parts |
| Noise 5% | 100 indoor unit from 18 dB(A) | 100 indoor unit from 18 dB(A) |
| MrCool DIY Hyper Heat 5th Gen 12,000 BTU 230V | MrCool DIY 5th Gen 12,000 BTU 115V | |
|---|---|---|
| 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) | 12,500 Btu/h | 8,500 Btu/h |
| Heating at 5 °F (max) | 11,000 Btu/h | 8,400 Btu/h |
| Heat kept at 5 °F | 92% | 70% |
| Price per 1,000 Btu/h at 5 °F | $230 | $209 |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 10 | 10.2 |
| SEER2 | 23.5 | 23.5 |
| EER2 | 12.8 | 12.5 |
| COP at 5 °F | 1.80 | 2.09 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 216032549 | 216032544 |
| Operating range | ||
| Heats down to | -22 °F | -13 °F |
| Cooling range | -22 to 122 °F | -13 to 122 °F |
| Installation | ||
| Line set connection | Quick-connect (no vacuum pump) | Quick-connect (no vacuum pump) |
| Line set | 25 ft included, up to 75 ft | 25 ft included, up to 75 ft |
| Voltage | 230 V | 115 V |
| Refrigerant | R-454B | R-454B |
| Indoor unit | DIY-12-HP-WMAH-230D25-O | DIY-12-HP-WMAH-115D25-O |
| Outdoor unit | DIYHH-12-HP-C-230D25-O | DIY-12-HP-C-115D25-O |
| Build | ||
| Indoor noise | 18–45.5 dB(A) | 18–43 dB(A) |
| Outdoor noise | 56.5 dB(A) | 54 dB(A) |
| Wi-Fi | Built in | Built in |
| Room size (maker) | up to 550 sq ft | up to 550 sq ft |
| Weight | indoor 24.5 lb / outdoor 72.3 lb | indoor 24.9 lb / outdoor 65.5 lb |
| Warranty | 7 yr compressor, 5 yr parts | 7 yr compressor, 5 yr parts |
| Warranty with DIY install | Yes | Yes |
