How much does whole-house air conditioning cost in the UK? (2026)

Costs9 min readUpdated June 2026

Bright, comfortable open-plan living room with whole-home climate control

Cooling a single room is one thing; getting even, comfortable temperatures across an entire house is another — and the price can swing dramatically depending on how you do it. Here is a straight-talking 2026 guide to what whole-house air conditioning really costs in the UK, and how to avoid paying for the wrong system.

The quick answer: typical UK prices in 2026

There is no single "whole-house" price because it depends entirely on the route you take. As a 2026 rule of thumb for a typical UK home:

Portable units — £300 to £1,000 each. Cheap to buy, but they only cool one room, are noisy and need a hose out of a window. Not a real whole-home answer.
Single wall split — around £2,000 to £3,500 per room installed. Fine for one bedroom; multiply it up for a whole house and the maths gets painful.
Multi-split — roughly £3,500 to £6,000+ for a few rooms. One outdoor unit feeds several wall or ceiling units indoors.
Ducted whole-home air conditioning — about £6,000 to £15,000+. Hidden distribution, but traditional rigid ducts can be hard to retrofit into UK homes.
Whole-home small-duct high-velocity — from around £5,495. A single discreet system that heats, cools and ventilates, with slim ducts that hide in the fabric of the house.

Every home is different, so treat these as ballpark figures. The only way to know your number is a proper spec of your property — you can get an instant indicative price here.

What actually drives the price

Five things move the cost more than anything else:

Size and number of rooms. More space and more zones means more kit and more labour.
Layout and access. Lofts, accessible voids and a sensible route for ducts keep costs down; solid walls and awkward access push them up.
Electrical work. Some installs need a consumer-unit upgrade or a new circuit.
Zoning and controls. Independent room-by-room temperatures and smart control add cost but a lot of comfort.
Efficiency and brand. Higher-rated, quieter, heat-pump-ready equipment costs more upfront and usually less to run.

Don't forget running costs

Installation is only half the picture. As a guide, cooling typically costs somewhere between 20p and 60p per hour depending on the system and how hard it is working. Used sensibly — cooling the rooms you are in, when you need them — it is modest. Modern heat-pump-based systems are far more efficient than older units, and the same kit can take the chill off in winter. We break the numbers down in what air conditioning costs to run.

💡 Beware the "cheapest per room" trap. Splitting a house into several individual units often looks cheap line-by-line, then adds up: multiple outdoor boxes, several wall units, more maintenance and a patchwork of remotes. Doing it once, properly and hidden, is frequently better long-term value.

The whole-home option that also heats and ventilates

This is where a small-duct high-velocity system changes the sums. Instead of a visible unit per room, a single compact air handler feeds slim 50–63mm ducts that thread invisibly through your walls, floors and ceilings, with small, neat outlets in each room. One system heats in winter, cools in summer and delivers fresh, filtered air all year — no radiators, no wall cassettes, no rows of outdoor condensers.

Because you are buying one integrated system rather than stitching together several, the whole-home price is clear and predictable. Custom Comfort gives you an instant fixed-price guide based on your home, with no payment taken and no obligation.

See what whole-home comfort would cost

Configure your Custom Comfort system and get an instant indicative price in about 60 seconds — no payment, no pressure.

Price your system Request a callback

Frequently asked questions

How much does it cost to air condition a whole house in the UK?

As a 2026 guide, whole-home cooling ranges from roughly £3,500 to £6,000 for a few rooms via multi-split, up to £6,000 to £15,000-plus for traditional ducted systems. A whole-home small-duct high-velocity system that also heats and ventilates starts from around £5,495 depending on the size of your home.

Is ducted air conditioning cheaper than multiple split units?

For a whole house it often works out comparable or better, because several individual splits mean multiple outdoor units, several wall boxes and more maintenance. A single ducted or small-duct high-velocity system is hidden and usually more cost-effective to live with long term.

Does whole-house air conditioning add value to a UK home?

Increasingly, yes. As summers warm, discreet whole-home climate control — especially a system that also heats and improves air quality — is moving from novelty to a feature buyers notice.

Can one system heat and cool the whole house?

Yes. Modern systems work as heat pumps, so the same equipment cools in summer and heats in winter. A small-duct high-velocity system adds fresh-air ventilation too, so it does all three jobs from one hidden system.

How much does air conditioning cost to run per hour in the UK?

Typically around 20p to 60p per hour depending on the system, the weather and how hard it is working. Heat-pump-based systems used sensibly are notably cheaper to run than older units.

← Back to all advice