Ceiling Cassette Air Conditioning Cost UK (2026)
A ceiling cassette sits flush in a suspended ceiling and blows conditioned air in two or four directions, which makes it the standard choice for offices, shops and larger open-plan rooms. Here is what a cassette costs supplied and installed in 2026, what the ceiling needs to look like for one to be possible, and when a wall-mounted unit is the cheaper, better answer.
Ceiling cassette installation costs in 2026
Prices below are for a single cassette supplied, installed and commissioned by an F-Gas certified engineer, including the outdoor unit, pipework, condensate pump and a standard wall or ground bracket. VAT is included.
| Scenario | Typical installed cost | What drives it |
|---|---|---|
| Compact cassette, accessible ceiling, short run | £2,000–£2,600 | Existing grid ceiling, outdoor unit within a few metres, single-phase supply already nearby |
| Standard four-way cassette, office or kitchen-diner | £2,600–£3,300 | 600 × 600 mm grid unit, 10–15 m pipe run, condensate pump, basic controller |
| Large cassette or difficult ceiling | £3,300–£4,000 | Higher capacity, plasterboard ceiling cut and made good, crane or scaffold for the outdoor unit, wired controller |
| Wall-mounted single split (for comparison) | £1,500–£3,000 | Same cooling capacity delivered by a wall unit; typical jobs land at £1,800–£2,500 |
Air Con Surrey 2026 baselines for supplied-and-installed work in Surrey and the South of England. Quotes for identical jobs can differ by a third, so always compare at least two.
The per-unit figure of £2,000–£4,000 is higher than a wall unit of the same capacity because the cassette costs more, it needs a condensate lift pump, and the installer spends longer in the ceiling void. Two cassettes on one outdoor unit are priced like a three-room multi-split (£4,500–£7,500). For how any quote is built up see the installation cost guide.
What the ceiling needs before a cassette is possible
The biggest factor is what is above the ceiling. Engineers ask about three things before they quote.
A void of roughly 250 mm or more
A standard cassette chassis is around 250–300 mm deep and needs a little clearance above for the drain hose and pipe bends. Suspended grid ceilings usually have this; plasterboard fixed directly to joists usually does not. Slimline cassettes exist for shallower voids but give up capacity and cost more per kilowatt.
A route for pipes and condensate
Refrigerant pipes, a cable and a condensate line must run from the cassette to an outside wall; in a domestic ceiling that may mean lifting floorboards above. The built-in pump lifts condensate up to roughly 750 mm, after which the drain needs a gentle fall to outside.
Structural support
A cassette hangs from threaded rods fixed to joists or the slab, never to the ceiling tiles; awkward structure means access panels and more time. If your ceiling fails any of these tests, a wall-mounted single split will cool the same room for less, and our wall-mounted vs ceiling comparison goes through the trade-offs room by room.
Rooms and buildings that suit a ceiling cassette
Offices and meeting rooms, where four-way airflow covers a 30–60 m² space without blowing on anyone's desk and grid ceilings make fitting simple; see commercial installation. Kitchen-diners and open-plan rooms with bifolds and a cooking heat load, which are hard to cool from one wall. Loft conversions and garden rooms with an eaves or service void and no free wall. Retail units, salons, surgeries, restaurants and gyms are the other common homes for cassettes, usually several on a VRF or multi-split system: invisible, even air distribution, no wall space sacrificed. In a house the realistic choice is usually a compact one- or two-way cassette — many are sized to drop straight into a standard 600 × 600 mm ceiling grid tile — rather than the big four-way units that are really built for open commercial floors.
What a cassette costs to run
A cassette uses the same inverter heat-pump technology as a wall unit, so running costs follow capacity and hours, not shape. At the current electricity price of about 26p per kWh, a 2.5 kW unit drawing 0.7–0.9 kW costs around 18–23p an hour flat out and much less once it settles on a thermostat; a 5 kW office cassette draws roughly double. From 1 October 2026 the Ofgem cap rises about 4% to £1,723 a year, taking the unit rate to 26.32p, so those hourly figures barely move — a penny at most. On heating, a SCOP of 3.5–4+ means each unit of electricity delivers three and a half to four of heat, which is why an office cassette can be cheaper to run in winter than the electric panel heaters it replaces. See running costs for worked examples. The wider coil holds more dust than a wall unit, so an annual service at £75–£150 is what keeps those figures true.
Sources & methodology
- Installed-price ranges are Air Con Surrey 2026 baselines from engineer quotes across Surrey and the South of England, inclusive of VAT; access, pipe run and brand tier move individual quotes.
- Electricity based on the Ofgem price cap: £1,663/yr (about 26p/kWh) to 30 September 2026, rising to £1,723/yr (26.32p/kWh) from 1 October 2026.
- SCOP 3.5–4+ reflects current inverter cassettes; see our brand guide. Installation requires an F-Gas certified engineer.
FAQs
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