Cooling a five bedroom UK house is a multi-room design, not five times a one-room price and not a leaflet total. A 2026 illustration for a surveyed multi-split, with one outdoor unit and indoor units in the rooms you actually use, often sits in the mid to high thousands of pounds including VAT, and climbs with a second outdoor unit, pumps, long pipes, a board upgrade or London access. Several separate outdoor units can cost more in labour and in neighbour noise. This is an illustration, not a price list. An F-gas certified company does the refrigerant work.
Pipe limits on a five-bedroom hot night
A multi-split gathers several indoors onto one outdoor unit. You have one noise source and one planning conversation, and the pipes must reach that plant position inside the manual. Five bedrooms plus a living room can exceed one outdoor unit's pipe limits or its simultaneous capacity on a hot night. The survey should say so and price a second outdoor unit rather than stretching the first.
Several condensers, London access and the illustration band
Five separate condensers mean five supplies, five mounts and five places a neighbour can hear. They suit a house that is too deep for one plant position, or a plan to fit two rooms now and stop. Write the room list down. It is the main cost fork. Cool the rooms you occupy, not every box room.
Treat mid to high thousands as a planning band for a straightforward multi-split on a typical house, where the outdoor site works and most drains fall. A pump, a long route through a loft, scaffold, or a consumer unit with no spare way sits on top. A price that looks dramatically cheaper may have dropped bedrooms or left electrics and making good to you.
London parking, a pavement elevation, a mansion-block style townhouse and restricted hours add time. Align the rooms, the outdoor position and the drain on every price before you compare logos. London access can move the figure as much as the brand.
Heat in a north bedroom, and the boiler
These systems are usually air-to-air heat pumps, so heating a cold north bedroom is available. It does not retire the boiler by itself. Outdoor siting in England still follows Planning Portal heat pump conditions, including noise and boundaries.
Frequently asked questions
Do I have to cool all five bedrooms?
No. Main bedrooms and the living room are the usual first list. Say so, because the outdoor unit you buy now can limit what you add later.
Is a multi-split always cheaper than five outdoor units?
Often on labour, electrics and noise. Pipe length or a simultaneous load can force two outdoor units. The survey should price the real layout.
Why do London quotes sit higher?
Parking, hours, scaffold and harder plant positions show up often. They are access costs, not a flat surcharge on the same garden job.
Do empty bedrooms still cost money if they have indoor units?
Empty bedrooms are the leak. Timers and shut doors on unused rooms matter more than a small efficiency gap between brands.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.