The 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.
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
| Capacity (certified) | |
|---|---|
| Size (nominal) | 36,000 BTU |
| Cooling at 95 °F | 36,000 Btu/h |
| Heating at 47 °F | 36,000 Btu/h |
| Heating at 17 °F (max) | 26,300 Btu/h |
| Heating at 5 °F (max) | 22,000 Btu/h |
| Heat kept at 5 °F | 61% |
| Price per 1,000 Btu/h at 5 °F | $162 |
| Efficiency (certified) | |
| HSPF2 (Region IV) | 8.5 |
| SEER2 | 18 |
| EER2 | 8.5 |
| COP at 5 °F | 1.97 |
| ENERGY STAR | Not ENERGY STAR |
| AHRI certificate | 216032548 |
| Operating range | |
| Heats down to | -13 °F |
| Cooling range | -13 to 122 °F |
| Installation | |
| Line set connection | Quick-connect (no vacuum pump) |
| Line set | 25 ft included, up to 75 ft |
| Voltage | 230 V |
| Refrigerant | R-454B |
| Indoor unit | DIY-36-HP-WMAH-230D25-O |
| Outdoor unit | DIY-36-HP-C-230D25-O |
| Build | |
| Indoor noise | 27.5–55.5 dB(A) |
| Outdoor noise | 60.5 dB(A) |
| Wi-Fi | Built in |
| Room size (maker) | up to 1,550 sq ft |
| Weight | indoor 48.7 lb / outdoor 152.1 lb |
| Warranty | 7 yr compressor, 5 yr parts |
| Warranty with DIY install | Yes |
The best-value quick-connect line: the same certified system as Pioneer’s Quantum Ultra, close to Della’s Optima, without the vacuum pump, for the same price or a few hundred dollars more.
Amazon $2,619Compare the MrCool DIY 5th Gen 36,000 BTU 230V with any other DIY mini-split →
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