The maker's photo for this series, not this exact size; the outdoor unit grows with capacity
Fujitsu General · Single-Zone
ASUH15KZAS / AOUH15KZAH1
~$3,274approximate retailer price at last check, equipment only
Best forCold-climate bedrooms and living rooms where you want a premium Japanese-brand unit for less than the Mitsubishi FX.
The Orion XLTH is Fujitsu's top wall-mounted line and the 15,000 BTU size is the middle of the range, which suits a large bedroom or a small open living area. It is rated 27.5 SEER2 and 12.7 HSPF2 and Fujitsu says it heats at the rated output down to -15°F. Published peak output reaches 25,000 BTU of heat. It is the R-32 successor to the old RLS3H Halcyon line. Price at retail is around $3,270 for the pair, which puts it near a Mitsubishi FX15 ($3,800) but with the Fujitsu installer network, which is thinner in many regions. Wi-Fi is the catch: Fujitsu's own page does not list it as built in, so budget for the accessory if you want app control.
At 5°F it makes more heat than its 47°F rating (117%), according to the certified NEEP listing for this pairing. Fujitsu General rates it to keep running down to -15°F.
Pairing: AOUH15KZAH1 with ASUH15KZAS. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.
Fujitsu's floor is -15°F, and NEEP certifies 18,000 BTU at 47°F and 21,000 BTU at 5°F with a COP of 2.1. Output at 5°F is 1.4 times the 15,000 BTU label, which is solid for a single room or open space. It is a good fit for a cold-climate main living area.
The XLTH 15k is rated 27.5 SEER2 and 12.7 HSPF2 at about $3,274, against the FX15's 25.9 and 11 at about $3,786. The Mitsubishi certifies 22,200 BTU at 5°F against Fujitsu's 21,000 and goes to -22°F. The Fujitsu is cheaper and more efficient on paper; the Mitsubishi has more cold-weather margin.
The base term is 5 years parts and 7 years compressor. It extends to 10 years if you register within 60 days, and to 12 years with an install by a Fujitsu Elite contractor.
Both units run on a 208/230V, 20A circuit, and the lineset is 1/4" x 1/2" with a 98 ft maximum run and 82 ft maximum rise. It uses R-32, an A2L mildly flammable refrigerant, so use a trained installer.
It is listed for about 600 sq ft. That suits a large bedroom or a main living space with a reasonably open plan.
Series photoFujitsu General · Single-Zone
~$3,053
Cold-climate buyers who want the best paper specs in the 12k flagship class and have a Fujitsu Elite contractor nearby.
Series photoFujitsu General · Single-Zone
~$2,957
Large rooms in mild climates where a branded 24k is wanted without the XLTH price.
Fujitsu General · Single-Zone
~$2,789
Small, well-insulated spaces — bedrooms, ADUs, passive-house builds — where maximum efficiency justifies a premium per-BTU price.