Fujitsu Orion XLTH+ 12,000 BTU
#2 in 12,000 BTUFull review
Fujitsu’s top cold-climate unit and among the most efficient here: it makes far more than its rated heat at 5 °F and heats to −22 °F. Sold only at 9,000 and 12,000 BTU.
The Fujitsu Orion XLTH+ 12,000 BTU is the better mini-split overall, rated 4.9 to 4.4. The Fujitsu Orion XLTH+ 12,000 BTU leads on efficiency and cold weather. The Mitsubishi Hyper-Heat GX 12,000 BTU wins on noise.
Mitsubishi Hyper-Heat GX 12,000 BTU
#9 in 12,000 BTUFull review
Mitsubishi’s mainstream Hyper-Heat line keeps its full rated heat at 5 °F and heats down to −13 °F. The FX goes further in deep cold and efficiency.
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+ 12,000 BTU for efficiency (13.7 HSPF2, 31.5 SEER2, COP 2.18 at 5 °F vs 10 HSPF2, 25.6 SEER2, COP 1.80 at 5 °F) and cold weather (keeps 134% of its heat at 5 °F, heats down to -22 °F vs keeps 100% of its heat at 5 °F, heats down to -13 °F).
- Choose the Mitsubishi Hyper-Heat GX 12,000 BTU for noise (indoor unit from 19 dB(A) vs indoor unit from 23 dB(A)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 12,000 BTU mini-split; a clear win is highlighted. How we rank explains each one.
| Factor weight | Fujitsu Orion XLTH+ 12,000 BTU | Mitsubishi Hyper-Heat GX 12,000 BTU |
|---|---|---|
| Overall rating | 4.9/5 | 4.4/5 |
| Cold weather 40% | 100 keeps 134% of its heat at 5 °F, heats down to -22 °F | 87 keeps 100% of its heat at 5 °F, heats down to -13 °F |
| Efficiency 30% | 92 13.7 HSPF2, 31.5 SEER2, COP 2.18 at 5 °F | 62 10 HSPF2, 25.6 SEER2, COP 1.80 at 5 °F |
| Warranty 20% | 100 10-year compressor, 10-year parts | 100 10-year compressor, 10-year parts |
| Noise 10% | 81 indoor unit from 23 dB(A) | 100 indoor unit from 19 dB(A) |
Specifications
| Fujitsu Orion XLTH+ 12,000 BTU | Mitsubishi Hyper-Heat GX 12,000 BTU | |
|---|---|---|
| Capacity (certified) | ||
| Size (nominal) | 12,000 BTU | 12,000 BTU |
| Cooling at 95 °F | 12,000 Btu/h | 12,000 Btu/h |
| Heating at 47 °F | 15,300 Btu/h | 12,300 Btu/h |
| Heating at 17 °F (max) | 22,800 Btu/h | 16,000 Btu/h |
| Heating at 5 °F (max) | 20,500 Btu/h | 12,300 Btu/h |
| Heat kept at 5 °F | 134% | 100% |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 13.7 | 10 |
| SEER2 | 31.5 | 25.6 |
| EER2 | 16.7 | 13.3 |
| COP at 5 °F | 2.18 | 1.80 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 216018256 | 216626288 |
| Operating range | ||
| Heats down to | -22 °F | -13 °F |
| Cooling range | 14 to 122 °F | 14 to 115 °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 66 ft | up to 65 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-32 | R-454B |
| Indoor unit | ASUH12KTAS | MSZ-GX12NL |
| Outdoor unit | AOUH12KTAP1 | MUZ-GX12NLHZ |
| Build | ||
| Indoor noise | 23–45 dB(A) | 19–45 dB(A) |
| Outdoor noise | 48 dB(A) | 49 dB(A) |
| Wi-Fi | Built in | Built in |
| Weight | indoor 31 lb / outdoor 93 lb | indoor 23 lb / outdoor 82 lb |
| Warranty | 10 yr compressor, 10 yr parts | 10 yr compressor, 10 yr parts |
| Warranty with DIY install | No, a licensed installer is required | No, a licensed installer is required |
| Released | - | 2025-03 |