Senville’s budget line, for cooling and mild winters: it stops heating below 5 °F, and the 5-year warranty needs a licensed installer.
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
The rating comes from 4 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) | 12,000 BTU |
| Cooling at 95 °F | 12,000 Btu/h |
| Heating at 47 °F | 12,000 Btu/h |
| Heating at 17 °F (max) | 9,000 Btu/h |
| Heating at 5 °F (max) | 6,600 Btu/h |
| Heat kept at 5 °F | 55% |
| Price per 1,000 Btu/h at 5 °F | $121 |
| Efficiency (certified) | |
| HSPF2 (Region IV) | 8.7 |
| SEER2 | 21.2 |
| EER2 | 10.1 |
| COP at 5 °F | 1.84 |
| ENERGY STAR | Not ENERGY STAR |
| AHRI certificate | 215735287 |
| Operating range | |
| Heats down to | 5 °F |
| Installation | |
| Installed by | Professional (sold through installers) |
| Line set connection | Flare fittings (vacuum pump needed) |
| Line set | up to 82 ft |
| Voltage | 115 V |
| Refrigerant | R-454B |
| Indoor unit | SENL-12CD-ILL |
| Outdoor unit | SENL-12CD-OL |
| Build | |
| Indoor noise | 17.5–45 dB(A) |
| Outdoor noise | 54 dB(A) |
| Wi-Fi | Built in |
| Room size (maker) | up to 750 sq ft |
| Weight | indoor 19.4 lb / outdoor 61.3 lb |
| Warranty | 5 yr compressor, 5 yr parts |
| Warranty with DIY install | No, a licensed installer is required |
A middle step between MrCool’s Select and DIY 5th Gen: quick-connect and a fair warranty, but it loses much of its heat in a cold snap. Best for mild winters.
MRCOOL DIY Direct $1,599Senville’s budget line, for cooling and mild winters: it stops heating below 5 °F, and the 5-year warranty needs a licensed installer.
Senville $869.99For mild climates and occasional use, where a low price for a quick-connect unit matters most. The short warranty and weak cold-weather output make it a poor main heat source.
Amazon $1,549 MRCOOL DIY Direct $1,399Compare the Senville Leto 12,000 BTU 115V with any other mini-split →
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