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 and the Senville Aura 18,000 BTU are evenly matched, rated 4.5 and 4.5. The Fujitsu Orion XLTH 18,000 BTU leads on efficiency and warranty. The Senville Aura 18,000 BTU wins on cold weather and noise.
Senville Aura 18,000 BTU
#5 in 18,000 BTUFull review
A cold-climate unit sold online by Senville that keeps most of its rated heat at 5 °F and heats to −22 °F. Parts cover is 5 years, half the compressor’s 10.
Senville $1,599.99$1,599.99
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 efficiency (12.5 HSPF2, 25.5 SEER2, COP 2.02 at 5 °F vs 11 HSPF2, 21.4 SEER2, COP 1.92 at 5 °F) and warranty (10-year compressor, 10-year parts vs 10-year compressor, 5-year parts).
- Choose the Senville Aura 18,000 BTU for cold weather (keeps 100% of its heat at 5 °F, heats down to -22 °F vs keeps 118% of its heat at 5 °F, heats down to -15 °F) and noise (indoor unit from 27 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 Aura 18,000 BTU |
|---|---|---|
| Overall rating | 4.5/5 | 4.5/5 |
| Cold weather 40% | 90 keeps 118% of its heat at 5 °F, heats down to -15 °F | 100 keeps 100% of its heat at 5 °F, heats down to -22 °F |
| Efficiency 30% | 86 12.5 HSPF2, 25.5 SEER2, COP 2.02 at 5 °F | 72 11 HSPF2, 21.4 SEER2, COP 1.92 at 5 °F |
| Warranty 20% | 100 10-year compressor, 10-year parts | 87 10-year compressor, 5-year parts |
| Noise 10% | 48 indoor unit from 30 dB(A) | 62 indoor unit from 27 dB(A) |
Specifications
| Fujitsu Orion XLTH 18,000 BTU | Senville Aura 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 | 18,000 Btu/h |
| Heating at 17 °F (max) | 27,200 Btu/h | 19,200 Btu/h |
| Heating at 5 °F (max) | 25,400 Btu/h | 18,000 Btu/h |
| Heat kept at 5 °F | 118% | 100% |
| Price per 1,000 Btu/h at 5 °F | - | $89 |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 12.5 | 11 |
| SEER2 | 25.5 | 21.4 |
| EER2 | 14 | 12.5 |
| COP at 5 °F | 2.02 | 1.92 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 215647921 | 215735297 |
| Operating range | ||
| Heats down to | -15 °F | -22 °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 | SENA-18HF-IGG |
| Outdoor unit | AOUH18KZAH1 | SENA-18HF-OG |
| Build | ||
| Indoor noise | 30–46 dB(A) | 27–49 dB(A) |
| Outdoor noise | 47 dB(A) | 59 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 33.5 lb / outdoor 101.4 lb |
| Warranty | 10 yr compressor, 10 yr parts | 10 yr compressor, 5 yr parts |
| Warranty with DIY install | No, a licensed installer is required | No, a licensed installer is required |