Fujitsu Orion XLTH 18,000 BTU
#4 in 18,000 BTUFull review
Fujitsu’s cold-climate line, with more than its rated heat at 5 °F and very high certified efficiency, for homes heating through a cold winter.
The Fujitsu Orion XLTH 18,000 BTU is the better mini-split overall, rated 4.5 to 2.8. The Fujitsu Orion XLTH 18,000 BTU leads on cold weather, efficiency and warranty. The Senville Leto 18,000 BTU wins on noise.
Senville Leto 18,000 BTU
#20 in 18,000 BTUFull review
Senville’s budget line, for cooling and mild winters: it stops heating below 5 °F, and the 5-year warranty needs a licensed installer.
Senville $999.99$999.99
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.
Which should you buy?
- Choose the Fujitsu Orion XLTH 18,000 BTU for cold weather (keeps 118% of its heat at 5 °F, heats down to -15 °F vs keeps 61% of its heat at 5 °F, heats down to 5 °F), efficiency (12.5 HSPF2, 25.5 SEER2, COP 2.02 at 5 °F vs 9.6 HSPF2, 19.2 SEER2, COP 2.15 at 5 °F) and warranty (10-year compressor, 10-year parts vs 5-year compressor, 5-year parts).
- Choose the Senville Leto 18,000 BTU for noise (indoor unit from 24 dB(A) vs indoor unit from 30 dB(A)).
Scores side by side
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 | Fujitsu Orion XLTH 18,000 BTU | Senville Leto 18,000 BTU |
|---|---|---|
| Overall rating | 4.5/5 | 2.8/5 |
| Cold weather 40% | 90 keeps 118% of its heat at 5 °F, heats down to -15 °F | 13 keeps 61% of its heat at 5 °F, heats down to 5 °F |
| Efficiency 30% | 86 12.5 HSPF2, 25.5 SEER2, COP 2.02 at 5 °F | 50 9.6 HSPF2, 19.2 SEER2, COP 2.15 at 5 °F |
| Warranty 20% | 100 10-year compressor, 10-year parts | 49 5-year compressor, 5-year parts |
| Noise 10% | 48 indoor unit from 30 dB(A) | 76 indoor unit from 24 dB(A) |
Specifications
| Fujitsu Orion XLTH 18,000 BTU | Senville Leto 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 | 21,600 Btu/h | 18,800 Btu/h |
| Heating at 17 °F (max) | 27,200 Btu/h | 14,800 Btu/h |
| Heating at 5 °F (max) | 25,400 Btu/h | 11,500 Btu/h |
| Heat kept at 5 °F | 118% | 61% |
| Price per 1,000 Btu/h at 5 °F | - | $87 |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 12.5 | 9.6 |
| SEER2 | 25.5 | 19.2 |
| EER2 | 14 | 10.8 |
| COP at 5 °F | 2.02 | 2.15 |
| ENERGY STAR | ENERGY STAR Cold Climate | Not ENERGY STAR |
| AHRI certificate | 215647921 | 215735290 |
| Operating range | ||
| Heats down to | -15 °F | 5 °F |
| Cooling range | 14 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 164 ft | up to 98.4 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-32 | R-454B |
| Indoor unit | ASUH18KZAS | SENL-18CD-ILL |
| Outdoor unit | AOUH18KZAH1 | SENL-18CD-OL |
| Build | ||
| Indoor noise | 30–46 dB(A) | 24–50.5 dB(A) |
| Outdoor noise | 47 dB(A) | 56 dB(A) |
| Wi-Fi | Built in | Built in |
| Room size (maker) | - | up to 1,000 sq ft |
| Weight | indoor 36 lb / outdoor 117 lb | indoor 24.5 lb / outdoor 72.3 lb |
| Warranty | 10 yr compressor, 10 yr parts | 5 yr compressor, 5 yr parts |
| Warranty with DIY install | No, a licensed installer is required | No, a licensed installer is required |