Daikin FFA18AVJU9 Four-Way Cassette 18,000 BTU

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

Daikin · Ceiling Cassette

Daikin FFA18AVJU9 Four-Way Cassette 18,000 BTU

FFA18AVJU9 / RXV18AVJU9

~$3,498approximate retailer price at last check, equipment only

BTU/h
18k
Volts
208/230
Zones
1
SEER2
18.2
HSPF2
8.5
Heats to
5°F
Refrig.
R-32
Covers
—
Wi-Fi
Add-on

Best forLarge open rooms on a tighter equipment budget, in climates that stay above 5°F.

Overview

The 18k is the largest of Daikin's four-way cassettes, with 18,800 BTU of cooling and 21,800 BTU of heating. It rates 18.2 SEER2, 11.5 EER2 and 8.5 HSPF2, the lowest efficiency of the Daikin cassettes. It costs about $3,500, around $800 under the Fujitsu ACUH18 at about 3.7 SEER2 less, so the choice is up-front price against running cost. The outdoor unit is bigger at 29-1/2 by 34-1/4 inches and 113 lb. Heating runs from 5°F to 64.4°F and cooling from 50°F to 114.8°F, so it suits garages, shops and open living areas in climates that rarely drop below freezing. Daikin sells it as a three-part set of indoor unit, decorative panel and outdoor unit, and the panel is included in the price.

  • ~$800 under Fujitsu ACUH18
  • Panel included in the set price

Cold-weather output

At 5°F it still makes 70% of its rated heat, according to the certified NEEP listing for this pairing. Daikin rates it to keep running down to 5°F.

47°F32°F17°F5°F21.6k15.2k
COP at 5°F
1.8
Refrigerant
R-32
AHRI cert.
218468386
ENERGY STAR cold climate
No

Pairing: RXV18AVJU with FFA18AVJU. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.

Strengths and catches

Strengths

  • +About $800 less than the Fujitsu 18k cassette
  • +Panel included
  • +Configurable airflow pattern
  • +21,800 BTU heating

Catches

  • −18.2 SEER2 and 8.5 HSPF2 are modest
  • −Stops heating at 5°F
  • −113 lb outdoor unit
  • −Wi-Fi is not built in; app control needs an add-on adapter

Questions buyers ask

What does the 18k Daikin cassette need electrically?+

A 20 A circuit. The outdoor unit weighs 113 lb and needs a solid pad or bracket.

How much heat is left at 5°F on the 18k cassette?+

NEEP lists 21,600 BTU at 47°F and 15,200 BTU at 5°F, about 70%, with COP 1.8. SEER2 is 18.2, HSPF2 is 8.5, and the maker's floor is 5°F.

Is it worth $3,498?+

It is just $400 over the 15k at $3,098. Choose it when the room needs the extra capacity.

Does the 18k cassette get the same warranty as Daikin's wall units?+

Yes. Daikin gives a 12-year limited parts warranty when the system is registered online within 60 days of installation. It covers parts, not labor, so ask the installer what their own labor guarantee covers.

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