How much does ducted air conditioning cost?

Ducted air conditioning typically costs between £6,000 and £15,000 to install in a UK home, and it is priced per project rather than per room. A smaller single-floor system can start around £5,000, while a large or high-spec whole-home installation can reach £18,000 to £20,000 or more. The reason for the wide spread is simple: one hidden indoor unit feeds several rooms through bespoke ductwork, so the cost tracks the number of rooms and zones, the size of the property, the duct runs involved, and whether it is fitted during a build or retrofitted into a finished house.

That makes ducted the priciest of the mainstream home options, and usually dearer to retrofit than a multi-split. What you get for the money is a discreet, whole-home finish: no wall boxes, just neat ceiling or wall grilles, with the working parts tucked into a loft or a bulkhead. This guide gives realistic UK cost bands by scope, explains what moves the price, compares ducted with multi-split, works a running-cost example at the current electricity rate, and shows when the premium is worth paying. For the wider picture across all system types, see our main guide to home air conditioning costs.

One honest caveat up front: no official or regulatory body publishes ducted installation prices. Every figure here is drawn from UK installers and cost aggregators, so treat them as bands to sense-check against live quotes, not fixed rates.

Ducted air conditioning cost by scope

Because ducted is a whole-project job, the clearest way to budget is by the number of rooms and zones you want to cover.

These bands are a synthesis of several 2026 UK installer and cost sources, which quote whole-home ducted anywhere from £5,000 to £30,000 depending on the property and design. The middle of that market, and the figure most homeowners should plan around, is roughly £6,000 to £15,000. The widest quotes at either end reflect very small systems on one hand and large, multi-zone, high-specification homes on the other.

What is ducted (concealed) air conditioning?

Ducted air conditioning hides the indoor unit out of sight. Instead of a box on the wall in each room, a single concealed fan-coil unit sits in a loft, a ceiling void or a boxed-in bulkhead, connected by refrigerant pipework to an outdoor condenser. It pushes cooled air (and warmed air, on a reverse-cycle system) through insulated ducts to discreet grilles in each room, usually with a central return-air grille drawing air back to be reconditioned.

The result is the tidiest finish of any home system: all you see are the grilles and the outdoor unit. Larger systems are zoned, using dampers and controllers so you can cool the rooms in use and leave the rest, which matters a great deal for running costs. The trade-off is that ducted needs somewhere to run the ducts, so it depends on having enough ceiling height, void space or a bulkhead, and it is not always feasible in older properties with low ceilings.

What's included, and what moves the price

A ducted quote is really several jobs rolled into one, which is why the components add up. As a rough breakdown of a whole-home system, expect the equipment (the indoor fan-coil, outdoor condenser and pipework) to run £4,000 to £10,000, the ductwork and grilles £2,000 to £6,000, the installation labour £2,000 to £5,000, and zoning controls a further £500 to £2,000.

The biggest levers on the final figure are:

• Number of rooms and zones. More grilles and a bigger duct tree mean more materials and labour. This is the single largest driver.

• Property size and layout. Bigger homes need higher-capacity kit and longer duct runs.

• Retrofit versus build or renovation. Fitting ducted into a finished house means lifting floors, opening ceilings or building bulkheads, which is significantly more expensive and disruptive than running the ducts while a property is already open (more on this below).

• Loft and ceiling access. Easy, roomy void space keeps costs down; tight or awkward access pushes them up.

• Condenser siting and pipe runs. Placing the outdoor unit and running longer pipework adds cost, with runs beyond about five metres and difficult siting each adding a few hundred pounds.

• Electrical work. A ducted system usually needs its own supply, adding roughly £150 to £1,000.

• Region. London and the South East commonly add 20% to 30% over baseline pricing.

Ducted also takes longer to install than a split, typically several days to over a week (around three to ten days), against about a day for a single wall unit. That labour time is part of why the total is higher.

Ducted vs multi-split: which costs less?

If you want to cool several rooms but ducted looks steep, a multi-split system is usually the cheaper way to do it in an existing home. A multi-split runs several wall units from one outdoor condenser, so you avoid the ductwork and structural work that ducted needs.

Room for room, multi-split usually comes in lower and is far less disruptive to fit, which is why it is the default choice for retrofitting an occupied home. Ducted wins on looks and on a genuinely seamless whole-home finish, but you pay for the ductwork and the building work.

If you are cooling a finished house and can live with neat wall units, multi-split is usually the lower-cost, lower-disruption route. Ducted earns its premium when the ceilings are already coming down.

Is it worth retrofitting ducted into an existing house?

You can retrofit ducted into an existing home, but it is the most expensive scenario because the ducts have to be threaded through finished floors, ceilings and voids. The economics change completely if the timing is right. During a new build, a loft conversion, an extension or a major renovation, the ceilings and voids are already open, so the ductwork goes in with far less added labour and mess. That is when ducted makes the most financial sense.

If you are not planning building work and simply want cooling in a few rooms now, a multi-split or one or two single splits will almost always cost less and go in faster. Ducted is a project to plan around a renovation, not a quick summer fix.

How much does ducted air conditioning cost to run?

Running cost depends on the electrical power the system actually draws, which is much lower than its cooling output because these are efficient inverter heat pumps. Using the Ofgem price cap rate of 26.11p per kWh (1 July to 30 September 2026):

• Modest use. A system drawing around 1.5kW, cooling a couple of zones for 5 hours, uses 7.5 kWh. That is 7.5 × 26.11p = £1.96 a day.

• Whole-home, working hard. Drawing around 3kW for 8 hours across the house uses 24 kWh. That is 24 × 26.11p = £6.27 a day.

From 1 October 2026, VAT on domestic electricity is cut from 5% to 0%, which will trim these figures slightly.

So on a genuinely hot day you are looking at roughly £2 to £6 or more, depending on how much of the home you cool and how hard the system runs. Because a ducted system covers more space than a single split, it can cost more to run when you cool everywhere at once, which is exactly why zoning matters: conditioning only the rooms in use is the single biggest saving on the bill. Across a typical British summer, when you rarely run flat out, the seasonal total is far lower than these peak-day figures suggest.

Prices and rates correct as of July 2026. The Ofgem energy price cap changes quarterly (the next change is due around 26 August 2026), so check the current rate before budgeting.

The rules and costs people forget

A ducted system has a refrigerant circuit between the concealed unit and the outdoor condenser, so a few non-negotiables come with it:

• F-Gas installer. Any work on the refrigerant, which includes the whole installation, must be done by an F-Gas certified (REFCOM registered) engineer. Fitting a refrigerant system yourself is a criminal offence, so this is not a DIY project. Budget for professional installation from the start.

• Planning permission. The outdoor condenser is what planning looks at. A reverse-cycle unit, which heats as well as cools, can often go up under permitted development in England (under rules in force since 29 May 2025) if it meets the conditions on size, siting and noise (each unit no larger than 1.5m³, and no louder than 37 dB(A) at one metre from a neighbour's habitable-room window). A cooling-only unit is not covered and generally needs full planning permission. Flats, listed buildings and conservation areas are stricter. Always check with your local planning authority, and read our full guide to planning permission for air conditioning.

• Grants and VAT. A reverse-cycle ducted system that qualifies may be eligible for the £2,500 air-to-air Boiler Upgrade Scheme grant in England and Wales, but the conditions are tight: an MCS-certified installer, replacing an existing fossil-fuel or electric heating system, one per property. It is a modest offset against a project of this size, not "free air con". Qualifying permanently-fixed air-to-air heat pumps also carry 0% VAT until 31 March 2027. Check GOV.UK and Ofgem for current availability before you count on either.

Is ducted air conditioning worth the extra cost?

Ducted is worth the premium in three situations. First, in a new build or major renovation, where fitting the ductwork while ceilings are open removes most of the retrofit cost penalty. Second, when you want to cool the whole home discreetly and cannot accept wall units in every room, ducted delivers a finish nothing else matches. Third, in higher-spec homes where the seamless look and even, whole-home air distribution justify the spend.

If none of those apply, and you simply want effective cooling in a finished house for the lowest sensible outlay, a multi-split or single splits will usually serve you better for less. To weigh the options properly, see our guide on how to choose an air conditioning system, or browse ducted air conditioning systems to see what is available.

Because ducted is bespoke, the only way to a reliable figure is a survey and a quote. Prices vary widely by home, so compare more than one.