Cool — and heat — several rooms from a single outdoor unit, with every room controlled independently. A tidy, efficient choice for multi-room homes and offices.
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How it works
What is a multi split air conditioning system?
A multi split system connects two or more indoor units to a single outdoor unit using refrigerant pipework. Each indoor unit has its own remote or wall controller, so you can choose a different temperature in every room — or switch rooms off when nobody’s using them.
Because you only need one outdoor unit instead of several, multi split systems keep the outside of your home or building far tidier, and they’re often the best answer where wall or ground space is limited.
You can also mix indoor unit styles on the same system: wall-mounted units in the bedrooms, a floor console in a loft room, or ceiling cassettes in an office.
One outdoor unit, several indoor units — each room set to its own temperature.
Comparison
Multi split vs single split: which is better?
Both are excellent systems. The right one depends on your property and how many rooms you want to cool.
Multi split
Single splits
Outdoor units
One outdoor unit serves 2–5 rooms
One outdoor unit per room
Exterior appearance
Tidier — fewer units on the wall
More units to position
Room control
Independent temperature in every room
Independent temperature in every room
Heating & cooling at once
All rooms run in the same mode
Each room can heat or cool
If the outdoor unit fails
All connected rooms are affected
Only that room is affected
Best suited to
Several rooms, limited outdoor space
One or two rooms, or critical spaces
Benefits
Why choose multi split air conditioning?
Independent room control
Every room has its own settings, so everyone gets the temperature they want.
Fewer outdoor units
One outdoor unit can serve several rooms, keeping the exterior uncluttered.
Mix and match indoor units
Combine wall, floor and ceiling units within the manufacturer’s compatible range.
Efficient by design
Only run the rooms you’re using — no energy wasted on empty spaces.
Whole-home comfort
Bedrooms, living areas and a home office on one neatly planned system.
Ideal for small offices
Serve separate offices and meeting rooms without a wall of condensers outside.
Planning your system
How many indoor units can one outdoor unit run?
Most domestic multi split outdoor units support between two and five indoor units. A few things decide what’s right for you.
Total capacity
The combined capacity of the indoor units has to match what the outdoor unit can deliver. We calculate each room’s requirement first, then choose an outdoor unit to suit.
Pipe lengths and routes
Each indoor unit needs its own pipe run back to the outdoor unit, and manufacturers set limits on individual and total pipe length. Careful planning keeps runs short and discreet.
Can one room heat while another cools on a multi split?
Not on a standard multi split system. All the indoor units share one outdoor unit, so they run in the same mode — heating or cooling — at any one time, although each room can be set to its own temperature or switched off.
What happens if the outdoor unit breaks down?
Because every indoor unit relies on it, all the connected rooms are affected until it’s repaired. Regular servicing reduces the risk, and for critical spaces such as server rooms we may recommend a separate dedicated system.
Can I add more rooms to my multi split later?
Only if the outdoor unit has spare capacity and an unused connection. If you think you might extend the system — for example after a loft conversion — tell us at the quote stage and we’ll design for it.
Is a multi split cheaper than several single splits?
Not always. A multi split needs fewer outdoor units, which can save on equipment and installation, but the outdoor unit itself is larger and more expensive. We’ll price both options where it makes sense so you can compare.
