The Senville Elite 18,000 BTU is the better mini-split overall, rated 4.8 to 3.2. The Senville Elite 18,000 BTU leads on cold weather, efficiency and noise.
Senville’s top line makes more than its rated heat at 5 °F, heats to −22 °F and carries a 10-year parts and compressor warranty. Sold online, but the warranty needs a licensed installer.
Amazon $1,799.99 Senville $1,799.99Daikin’s entry line, for cooling and mild winters: it stops heating below 5 °F, but keeps Daikin’s 12-year registered warranty.
Prices 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 18,000 BTU mini-split; a clear win is highlighted. How we rank explains each one.
| Factor weight | Senville Elite 18,000 BTU | Daikin Oterra 18,000 BTU |
|---|---|---|
| Overall rating | 4.8/5 | 3.2/5 |
| Cold weather 40% | 100 keeps 113% of its heat at 5 °F, heats down to -22 °F | 24 keeps 70% of its heat at 5 °F, heats down to 5 °F |
| Efficiency 30% | 98 16.2 HSPF2, 25.6 SEER2, COP 2.34 at 5 °F | 50 9.6 HSPF2, 21 SEER2, COP 2.00 at 5 °F |
| Warranty 20% | 100 10-year compressor, 10-year parts | 100 12-year compressor, 12-year parts |
| Noise 10% | 62 indoor unit from 27 dB(A) | 33 indoor unit from 33 dB(A) |
| Senville Elite 18,000 BTU | Daikin Oterra 18,000 BTU | |
|---|---|---|
| Capacity (certified) | ||
| Size (nominal) | 18,000 BTU | 18,000 BTU |
| Cooling at 95 °F | 18,000 Btu/h | 18,000 Btu/h |
| Heating at 47 °F | 20,000 Btu/h | 21,600 Btu/h |
| Heating at 17 °F (max) | 23,200 Btu/h | 19,500 Btu/h |
| Heating at 5 °F (max) | 22,600 Btu/h | 15,200 Btu/h |
| Heat kept at 5 °F | 113% | 70% |
| Price per 1,000 Btu/h at 5 °F | $80 | - |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 16.2 | 9.6 |
| SEER2 | 25.6 | 21 |
| EER2 | 15 | 12 |
| COP at 5 °F | 2.34 | 2.00 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 217608151 | 217005314 |
| Operating range | ||
| Heats down to | -22 °F | 5 °F |
| Cooling range | - | 50 to 122 °F |
| Installation | ||
| Installed by | Professional (sold through installers) | Professional (sold through installers) |
| Line set connection | Flare fittings (vacuum pump needed) | Flare fittings (vacuum pump needed) |
| Line set | up to 98.4 ft | up to 99 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-454B | R-32 |
| Indoor unit | SENE-18EL-IHH | FTXF18BVJU9 |
| Outdoor unit | SENE-18EL-OH | RXF18BVJU9 |
| Build | ||
| Indoor noise | 27–54.5 dB(A) | 33–48 dB(A) |
| Outdoor noise | 57 dB(A) | 54 dB(A) |
| Wi-Fi | Built in | Built in |
| Room size (maker) | up to 1,000 sq ft | - |
| Weight | indoor 43.6 lb / outdoor 130.3 lb | indoor 28 lb / outdoor 113 lb |
| Warranty | 10 yr compressor, 10 yr parts | 12 yr compressor, 12 yr parts |
| Warranty with DIY install | No, a licensed installer is required | - |
