Fujitsu AOUH18KWAS2 18,000 BTU 2-Zone (2 x ASUH09KPAS)

AOUH18KWAS2 + 2x ASUH09KPAS

~$3,987approximate retailer price at last check, equipment only

BTU/h: 18k
Volts: 208/230
Zones: 2
SEER2: 22
HSPF2: 10.5
Heats to: 5°F
Refrig.: R-32
Covers: 700 ft²
Wi-Fi: Add-on

Best forTwo rooms in a mild-to-cold climate, installed by a Fujitsu-friendly contractor, who may later want ducted or cassette heads.

Overview

The R-32 replacement for Fujitsu's old 2-zone AOU18RLXFZ is a two-port, 18,000 BTU outdoor unit that works with the same wall, slim-duct, mid-static and cassette heads as the larger Airstage multis. NEEP certifies it at 22.0 SEER2 and 10.5 HSPF2 with wall-type heads, and lists 17,000 BTU/h at 5°F from a 22,000 BTU/h rating, about 77%. Fujitsu rates heating down to 5°F, so this is a mild-winter or supplemental setup, not an extreme-cold primary heat source. The 9k ASUH09KPAS head is WiFi capable through an optional adapter. With two heads the system comes to about $3,990 in equipment, a few hundred dollars under Mitsubishi's 2D20NLHZ multi at about $5,500 but without Hyper-Heat.

17,000 BTU/h at 5°F (NEEP)
Mixes wall, duct and cassette heads

Cold-weather output

At 5°F it still makes 77% of its rated heat, according to the certified NEEP listing for this pairing. Fujitsu General rates it to keep running down to 5°F.

COP at 5°F: 2.27
Refrigerant: R-32
AHRI cert.: 215447685
ENERGY STAR cold climate: Yes

Pairing: AOUH18KWAS2 with non-ducted heads. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.

Strengths and catches

Strengths

+NEEP lists 17,000 BTU/h at 5°F, about 77% of rated heat
+22.0 SEER2 / 10.5 HSPF2 with wall-type heads
+Accepts wall, slim-duct, mid-static duct and cassette heads on the same condenser

Catches

−Heating operation is rated from 5°F up only
−Wi-Fi on the ASUH09KPAS head needs an optional adapter
−Fujitsu excludes equipment bought online from its warranty

Questions buyers ask

How does the Fujitsu 2-zone hold up in cold weather?+

NEEP shows 22,000 BTU at 47°F and 17,000 BTU at 5°F, about 94% of the 18,000 nameplate, with COP 2.27. Fujitsu's floor is 5°F and it is ENERGY STAR cold climate listed. HSPF2 is 10.5.

What does the price include?+

$3,987 covers the R-32 outdoor unit plus two 9k ASUH09KPAS wall heads. Line sets and labor are extra.

Is the warranty worth the conditions?+

Standard is 5-year parts and 7-year compressor. Ten years needs a licensed-contractor install registered within 60 days, and 12 years via a Fujitsu Elite Contractor. Equipment bought online or on closeout is excluded.