The Senville Elite 18,000 BTU is the better mini-split overall, rated 4.8 to 4.1. The Senville Elite 18,000 BTU leads on efficiency and noise. The Senville Elite 18,000 BTU costs $49.97 less ($1,799.99 vs $1,849.96).
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 $1,799.99The best value for heating through a cold winter, if you can pull a vacuum yourself or pay someone to. It holds its full rated heat at 5 °F for far less than a quick-connect unit that does the same.
Amazon $1,849.96 Della $1,849.96Prices 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 | Della Optima Pro CloudAir 18,000 BTU 230V |
|---|---|---|
| Overall rating | 4.8/5 | 4.1/5 |
| Cold weather 40% | 100 keeps 113% of its heat at 5 °F, heats down to -22 °F | 99 keeps 99% of its heat at 5 °F, heats down to -22 °F |
| Efficiency 30% | 98 16.2 HSPF2, 25.6 SEER2, COP 2.34 at 5 °F | 57 10 HSPF2, 23.5 SEER2, COP 1.80 at 5 °F |
| Warranty 20% | 100 10-year compressor, 10-year parts | 70 lifetime parts once registered, no compressor term stated |
| Noise 10% | 62 indoor unit from 27 dB(A) | 29 indoor unit from 34 dB(A) |
| Senville Elite 18,000 BTU | Della Optima Pro CloudAir 18,000 BTU 230V | |
|---|---|---|
| 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 | 18,000 Btu/h |
| Heating at 17 °F (max) | 23,200 Btu/h | 15,500 Btu/h |
| Heating at 5 °F (max) | 22,600 Btu/h | 17,800 Btu/h |
| Heat kept at 5 °F | 113% | 99% |
| Price per 1,000 Btu/h at 5 °F | $80 | $104 |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 16.2 | 10 |
| SEER2 | 25.6 | 23.5 |
| EER2 | 15 | 12.5 |
| COP at 5 °F | 2.34 | 1.80 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 217608151 | 218471004 |
| Operating range | ||
| Heats down to | -22 °F | -22 °F |
| Cooling range | - | 5 to 131 °F |
| Installation | ||
| Installed by | Professional (sold through installers) | Sold for self-install (DIY) |
| Line set connection | Flare fittings (vacuum pump needed) | Flare fittings (vacuum pump needed) |
| Line set | up to 98.4 ft | 16.4 ft included, up to 65 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-454B | R-454B |
| Indoor unit | SENE-18EL-IHH | 048-TPH-18K2V-C-IN |
| Outdoor unit | SENE-18EL-OH | 048-TPH-18K2V-23S-OUT |
| Build | ||
| Indoor noise | 27–54.5 dB(A) | 34–48 dB(A) |
| Outdoor noise | 57 dB(A) | 58 dB(A) |
| Wi-Fi | Built in | Built in |
| Room size (maker) | up to 1,000 sq ft | up to 1,000 sq ft |
| Weight | indoor 43.6 lb / outdoor 130.3 lb | indoor 30.9 lb / outdoor 93.7 lb |
| Warranty | 10 yr compressor, 10 yr parts | lifetime parts (registered) |
| Warranty with DIY install | No, a licensed installer is required | Yes |
| Released | - | 2026-05 |
