The maker's photo for this series, not this exact size; the outdoor unit grows with capacity

Fujitsu General · Single-Zone

Fujitsu Airstage Orion XLTH 24,000 BTU

ASUH24KZAS / AOUH24KZAH1

~$4,559approximate retailer price at last check, equipment only

BTU/h: 24k
Volts: 208/230
Zones: 1
SEER2: 24
HSPF2: 11.9
Heats to: -15°F
Refrig.: R-32
Covers: 960 ft²
Wi-Fi: Add-on

Best forLarge open spaces in cold climates that need one big head with serious winter output.

Overview

The 24,000 BTU Orion XLTH is the largest cold-climate wall unit Fujitsu sells. It rates 24 SEER2 and 11.9 HSPF2, publishes 28,900 BTU cooling and 36,800 BTU heating at maximum, and keeps heating to -15°F. It is the version for a 900-plus sq ft open floor or a bonus room or garage conversion. Cost is the issue: about $4,560 for equipment alone. That is about $250 under the Mitsubishi GX24 ($4,815), and the Fujitsu has the better HSPF2, but it is far above a mainstream 24k from LG or Gree. The lineset is 3/8 x 5/8 inch, bigger than the smaller sizes, and both units need a 20A 208/230V circuit.

36,800 BTU max heat
About $250 under the Mitsubishi GX24

Cold-weather output

At 5°F it makes more heat than its 47°F rating (102%), according to the certified NEEP listing for this pairing. Fujitsu General rates it to keep running down to -15°F.

COP at 5°F: 2.06
Refrigerant: R-32
AHRI cert.: 215647924
ENERGY STAR cold climate: Yes

Pairing: AOUH24KZAH1 with ASUH24KZAS. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.

Strengths and catches

Strengths

+Published maximum heat of 36,800 BTU
+11.9 HSPF2 is better than the Mitsubishi GX24's 10
+About $250 below the Mitsubishi GX24 at retail

Catches

−About $4,560 for equipment alone
−Wi-Fi is not built in
−3/8" x 5/8" lineset is the bulkiest in the range
−Both indoor and outdoor units need their own 20A circuits
−Fewer Elite installers outside major metros

Questions buyers ask

What size space is the Fujitsu XLTH 24k for?+

It is listed for about 960 sq ft, a big open floor or a small whole house. NEEP certifies 25,200 BTU at 47°F, so it delivers slightly more heat than its label. Check the room's load rather than the floor area alone.

Does it keep its capacity at 5°F?+

Yes, NEEP certifies 25,800 BTU at 5°F with a COP of 2.06, almost flat from its 47°F figure. Fujitsu rates operation down to -15°F. That makes it a real cold-climate option.

How does it compare to the Mitsubishi FX24 and GX24?+

At about $4,559 it is cheaper than the FX24 (about $4,997) and GX24 (about $4,815). Its 24 SEER2 and 11.9 HSPF2 beat both on paper, and its 25,800 BTU at 5°F is close to the FX24's 26,600. The Mitsubishis go to -22°F and include Wi-Fi.

Is the 12-year warranty automatic?+

No. Base is 5 years parts and 7 years compressor. Registration within 60 days gets 10 years, and 12 years requires an Elite contractor install.