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) | 18,000 BTU |
| Cooling at 95 °F | 18,000 Btu/h |
| Heating at 47 °F | 18,800 Btu/h |
| Heating at 17 °F (max) | 14,800 Btu/h |
| Heating at 5 °F (max) | 11,500 Btu/h |
| Heat kept at 5 °F | 61% |
| Price per 1,000 Btu/h at 5 °F | $87 |
| Efficiency (certified) | |
| HSPF2 (Region IV) | 9.6 |
| SEER2 | 19.2 |
| EER2 | 10.8 |
| COP at 5 °F | 2.15 |
| ENERGY STAR | Not ENERGY STAR |
| AHRI certificate | 215735290 |
| 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 98.4 ft |
| Voltage | 230 V |
| Refrigerant | R-454B |
| Indoor unit | SENL-18CD-ILL |
| Outdoor unit | SENL-18CD-OL |
| Build | |
| Indoor noise | 24–50.5 dB(A) |
| Outdoor noise | 56 dB(A) |
| Wi-Fi | Built in |
| Room size (maker) | up to 1,000 sq ft |
| Weight | indoor 24.5 lb / outdoor 72.3 lb |
| Warranty | 5 yr compressor, 5 yr parts |
| Warranty with DIY install | No, a licensed installer is required |
A low price for a self-installer who owns or will rent a vacuum pump. The Klimaire DIY is the same certified system with quick-connect lines, and Della’s Optima has near-identical ratings for less.
Pioneer Mini Split store $1,538Daikin’s entry line, for cooling and mild winters: it stops heating below 5 °F, but keeps Daikin’s 12-year registered warranty.
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 $1,806Compare the Senville Leto 18,000 BTU with any other mini-split →
More from Senville: every Senville product ranked.
