Series photoFujitsu General · Ceiling Cassette
~$3,086
Fujitsu ACUH12KUAS Compact Cassette 12,000 BTU
Grid-ceiling rooms and offices that want the best-rated 12k cassette.
- BTU/h
- 12k
- Volts
- 208/230
- Refrig.
- R-32
- SEER2
- 23.7
- HSPF2
- 11.5
- Heats to
- -5°F
The maker's photo for this series, not this exact size; the outdoor unit grows with capacity
Fujitsu General · Ceiling Cassette
Fujitsu ACUH18KUAS Compact Cassette 18,000 BTU
ACUH18KUAS / AOUH18KUBS1
~$4,286approximate retailer price at last check, equipment only
- BTU/h
- 18k
- Volts
- 208/230
- Zones
- 1
- SEER2
- 21.9
- HSPF2
- 11.3
- Heats to
- -5°F
- Refrig.
- R-32
- Covers
- 750 ft²
- Wi-Fi
- Add-on
Best forOpen rooms around 750 sq ft that want a single flush ceiling unit.
Overview
The 18k version of Fujitsu's compact cassette keeps the same 22-7/16 inch square body and grille but moves up to 21.9 SEER2, 12.6 EER2 and 11.3 HSPF2, with 20,100 BTU of cooling and 23,900 BTU of heating at the listed point. It is aimed at open living areas or shop spaces of around 750 sq ft where a pair of 9k wall heads would be needed otherwise. At about $4,300 it costs roughly $1,200 more than the 12k and about $800 more than the Daikin FFA18 cassette, but rates 3.7 SEER2 higher than the Daikin and heats down to -5°F on the Fujitsu's published range. Wi-Fi remains an optional Airstage accessory.
- 23,900 BTU heating
- ~750 sq ft
Cold-weather output
No current listing on NEEP's cold-climate heat pump list (checked October 8, 2026). Fujitsu General rates it to keep running down to -5°F; without a listing there's no certified 5°F capacity figure to check that claim against.
Strengths and catches
Strengths
- +21.9 SEER2 and 11.3 HSPF2 at 18k
- +Same compact 22-7/16 in body as the 12k
- +Heating capacity of 23,900 BTU
- +Grille included
Catches
- −About $4,300 before labor
- −Wi-Fi is an optional accessory
- −Suction line moves to 1/2 inch, so a 12k lineset will not reuse
- −About $800 above the Daikin FFA18 system
Questions buyers ask
When does the 18k cassette make sense over the 12k?+
When a room needs more than 12,000 BTU but a cassette is still wanted. It costs $4,286 against $3,086 for the 12k.
Can the 18k cassette reuse a 12k lineset?+
No. It takes a 1/4 x 1/2 inch lineset (up to 98 ft), one size larger on the suction side than the 12k's 3/8 inch.
Is it NEEP certified for cold-climate use?+
No. It is not listed, so there is no certified capacity or COP at 5°F, though the maker's floor is -5°F. HSPF2 is 11.3.
What does Fujitsu require for the long warranty?+
Fujitsu's base term is 5 years on parts and 7 on the compressor. A licensed-contractor install registered online within 60 days raises it to 10 years on both, and a Fujitsu Elite contractor install to 12, so a self-install gives up the longer coverage.
Similar systems
Everything from Fujitsu GeneralSeries photoFujitsu General · Ceiling Cassette
~$6,295
Fujitsu AUUH24KUAS Large Circular Cassette 24,000 BTU
Large open rooms or light-commercial spaces around 1,000 sq ft.
- BTU/h
- 24k
- Volts
- 208/230
- Refrig.
- R-32
- SEER2
- 23.2
- HSPF2
- 11
- Heats to
- -5°F
Series photoFujitsu General · Single-Zone
~$4,036
Fujitsu Airstage Orion XLTH 18,000 BTU
Primary living spaces in cold climates that need 18k of capacity without the efficiency penalty.
- BTU/h
- 18k
- Volts
- 208/230
- Refrig.
- R-32
- SEER2
- 25.5
- HSPF2
- 12.5
- Heats to
- -15°F