Do cassette air conditioners need a drain pump?

Yes — always. Drain pan sits above floor level so gravity drainage isn't possible. Drain pump is built into the unit and lifts condensate up to a drain exit.

Cassette Air Conditioner Installation Brisbane — Complete Guide (2026)

Installer’s complete guide to ceiling cassette air conditioning in Brisbane homes and offices — what they cost, when they’re worth it over a wall split, ceiling-cavity requirements, brand pick, and the full install process.

Quick answer: Ceiling cassette install from $2,400 fully installed for a 3.5kW unit. Best for living rooms, offices, retail, and bedrooms where wall-mount aesthetics don’t work. Needs 250–350mm clear ceiling cavity and 30A power. 4-way airflow distributes more evenly than wall splits.

Brisbane cassette install

Free on-site ceiling assessment · From $2,400 · All major brands

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Cassette install pricing by capacity (2026)

Capacity	Room size (m²)	Fully installed (from, inc GST)	Best for
3.5kW	18–28 m²	From $2,400	Bedrooms, small offices, treatment rooms
5.0kW	25–40 m²	From $2,800	Living rooms, medium offices, classrooms
7.1kW	40–60 m²	From $3,400	Open-plan living, larger offices, retail
10.0kW	55–80 m²	From $4,200	Large open-plan, hospitality
14.0kW+	80+ m²	Quote on site	Commercial / large retail

Fully installed prices assume standard ceiling cavity access, existing electrical capacity, and a back-to-back pipe run. Bulkheads, custom grilles, and difficult access quoted on site.

When a cassette beats a wall split

Aesthetics matter. Cassette indoor unit sits flush with the ceiling — only the decorative grille is visible from below. No bulky white box on the wall.
Wall space is limited or precious. Open-plan living with floor-to-ceiling windows, feature walls, or art display walls leaves nowhere good for a wall split.
Even cooling across a large room. 4-way airflow from a centrally located cassette distributes much more evenly than a wall split blowing from one corner.
Commercial tenancies. Cassettes are the standard for office fitouts — clean ceiling appearance, professional look, no wall protrusions.
Hospitality and retail. Customers see the ceiling. Cassettes are less visually intrusive than wall splits in a cafe or retail space.

When a wall split is the better choice

Cathedral / raked ceilings. No ceiling cavity to recess the cassette into.
Insufficient cavity depth. Cassettes need 250–350mm clear above the ceiling grid. Some Brisbane Queenslanders have shallower cavities.
Budget priority. Wall splits from $1,600 vs cassettes from $2,400 — the price difference funds an extra room’s cooling.
Single bedroom. Wall splits direct airflow at one side of the room, which is often what you want in a bedroom (away from the bed).
Retrofit without ceiling work. Wall split goes in without disturbing the ceiling lining.

Ceiling cavity requirements

Cassettes recess into the ceiling cavity. The standard Daikin/Mitsubishi/Panasonic 3.5kW cassette body is about 250mm tall plus drain pump and flexible duct connections. Realistic minimum cavity depth: 320mm.

Brisbane home cavity reality:

Slab-on-ground modern builds (post-2000): typically 400–600mm cavity. Plenty of room.
Highset Queenslanders: often 350–500mm in main living areas. Usually workable.
Lowset 60–70s brick: sometimes only 200–280mm. Need bulkhead drop or wall-split alternative.
Apartments: highly variable — often 200–400mm depending on building era.
Cathedral / vaulted: no cavity — wall split required.

Cavity is checked during the free on-site assessment before quoting.

What’s included in the install price

Indoor cassette unit + decorative grille (white standard; designer grille options +$80–$200)
Outdoor compressor unit, sized to match
Up to 4m insulated refrigerant pipework
Condensate drain line + built-in drain pump (cassettes always need pump since drain is above floor level)
Standard electrical hookup to existing 15–20A power point
Ceiling cut-out, framing reinforcement, and cassette mounting hardware
Outdoor unit bracket or ground feet
Refrigerant top-up, vacuum, and pressure test
Full commissioning, run-test on cool and heat
10-year workmanship warranty
Manufacturer warranty registration

Add-ons and what they cost

Bulkhead drop (where ceiling cavity is too shallow) — from $450
New electrical circuit if no existing capacity — from $380
Designer grille (black, brushed metal, custom finishes) — from $80
Auto-clean panel (filter cleans itself) — from $250
3D auto-swing louvres — standard on premium models, add-on $180 on base models
WiFi controller — from $150 module
Wired wall controller (instead of remote) — from $220

Brand picks for Brisbane cassettes

Daikin FCAG (Skyair) — reliable, great parts availability, 5-yr warranty. The default for office and retail fitouts.
Mitsubishi Electric SLZ-M — quietest cassette on the market, premium MA Touch wired controller available. Great for medical/dental rooms.
Panasonic CS-Z — includes nanoe X air purification. Good for allergy/medical environments.
Fujitsu AUTG — best value cassette in the 3.5–5kW range.
LG UT — WiFi standard, 10-yr compressor warranty.

Install process — what happens on the day

Site protection. Drop sheets, dust barrier around the install area.
Ceiling cut-out. Square hole cut in the ceiling per template (typically 600x600mm).
Framing reinforcement. Timber framing added across the cut-out to support the cassette weight (~25–30kg).
Cassette lift. Two installers lift the cassette into the cavity, secure to the framing.
Refrigerant pipework. Run through ceiling cavity to the exterior, then to the outdoor unit.
Condensate drain + pump. Drain line from the cassette drain pump out to a gravity-drained exit.
Electrical. Connect cassette to existing or new circuit.
Outdoor unit install. Bracket or ground-feet mount, pipe and electrical connection.
Vacuum and charge. Refrigerant system vacuumed, leak-tested, then charged to spec.
Grille fit and commissioning. Decorative grille fitted last, system run-tested on cool and heat, supply air temps measured.
Walk-through. Operating the remote/controller, basic filter maintenance.

Total time: half-day for a single cassette in a straightforward install. Full day if ceiling reinforcement, new electrical, or bulkhead work is needed.

Common questions

How much does a ceiling cassette air conditioner cost in Brisbane?

From $2,400 inc GST fully installed for a 3.5kW unit. From $2,800 for 5.0kW. From $3,400 for 7.1kW. From $4,200 for 10kW. Final price depends on ceiling cavity, electrical needs, and brand/grille choice.

Is a cassette better than a wall split?

For large rooms, professional spaces and feature-wall rooms — yes. The 4-way airflow distributes more evenly and the flush ceiling fit looks much cleaner. For bedrooms and budget-priority installs, a wall split is usually better value.

How much ceiling cavity does a cassette need?

Minimum 320mm clear above the ceiling grid for standard 3.5–7kW cassettes. Larger commercial cassettes need more. Cavity is checked at on-site assessment before quoting.

Can I retrofit a cassette into an older Brisbane home?

Often yes — depends on cavity depth, ceiling structure, and access for pipework. Some lowset 60–70s brick homes have shallow cavities that need a bulkhead drop. Cathedral or vaulted ceilings can’t take a cassette — wall split is the alternative.

Are cassettes noisier than wall splits?

Slightly. Cassette fans are larger and the air-handling is more complex — typical lowest fan setting 26–30dB(A) versus 19–21dB(A) for premium wall splits. Mitsubishi’s SLZ cassette is the quietest at 26dB(A).

Do cassettes need a drain pump?

Yes — always. Drain pan in the cassette sits above floor level so gravity drainage isn’t possible. The drain pump is built into the unit and lifts condensate up and out to a drain exit.