Multi-Split Air Conditioner Installation

A multi-split system connects several indoor units across different rooms to a single outdoor condenser. Each indoor unit runs independently, so temperatures in each room can be set and adjusted separately. It is the most practical solution for cooling multiple rooms in a home or commercial space without needing to install more than one outdoor unit. We design and install multi-split systems across London and Essex, with a free site survey before any work begins.

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Find the right air conditioning system for your space

Multiple Rooms, One Outdoor Unit

Independent Temperature Control Per Room

Compact External Footprint

Multi-split AC indoor unit mounted on a wall in a London home

Why Choose Lux Cooling for Multi-Split Installation?

  • Pipework Planning Included: Multi-split systems require careful planning of the refrigerant pipework runs from each indoor unit back to the outdoor condenser. We produce a full pipework plan at the site survey stage.
  • Maximise Available Outdoor Space: Because only one outdoor unit is needed for multiple rooms, multi-split is the best option for properties with limited external wall or roof space.
  • Flexible Indoor Unit Types: Indoor units can be wall-mounted, cassette, or floor-mounted depending on the room. A single outdoor unit can support a mix of indoor unit types across different spaces.
  • Part of a Wider AC Service: We also carry out AC repairs and servicing and maintenance on multi-split systems of all makes and models.
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Why choose us for your multi-split air conditioning installation?

  • 20 Years of Experience

    We have installed and maintained AC systems for over 20 years in homes and businesses across London and Essex.

  • Free Survey and Quote

    We carry out a free site survey and provide a full written quote before any work is agreed. No call-out charges.

  • 1-Year Installation Warranty

    All our installations are backed by a 1-year warranty on workmanship.

  • Full Pipework Planning

    We plan all refrigerant pipework runs at the survey stage, confirming pipe lengths and routes before any work is agreed.

  • Mixed Indoor Unit Types Supported

    Wall-mounted, cassette, and floor-mounted units can all be connected to a single outdoor condenser in a multi-split configuration.

  • London and Essex Engineers

    Our engineers are based in Loughton and cover the whole of London and Essex, with fast response and local knowledge.

Multi-split AC outdoor condenser unit on the side of a house in Essex

Where Are Multi-Split Systems Installed?

Multi-split systems are the right choice wherever two or more rooms need cooling and only one outdoor unit position is available. They are particularly well suited to:

  • Semi-detached and terraced houses with limited external wall space
  • Flats in purpose-built blocks where only one condenser position is permitted
  • Homes where different family members want independent control of their room temperatures
  • Commercial offices where multiple separate rooms need cooling from one external unit
  • Properties in conservation areas or with planning restrictions on multiple external units

We confirm the maximum number of indoor units, pipe lengths, and suitable condenser position at the survey stage. See our full AC installation service, or visit the London and Essex pages for area-specific information.

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Benefits of Multi-Split Air Conditioning

Multi-split systems offer the flexibility of individual room control with the simplicity of a single outdoor installation. Key advantages include:

  • One outdoor unit for up to 5 indoor rooms: Depending on the system specification, a single outdoor condenser can support up to five separate indoor units, keeping the external installation compact.
  • Independent control in each room: Each indoor unit has its own controller, so occupants can set the temperature in their own room independently of the rest of the property.
  • Mix of indoor unit types: Wall-mounted, cassette, and floor-mounted units can be mixed within the same multi-split system, allowing the best unit type to be selected for each room.
  • Lower installation cost than multiple single splits: Installing one multi-split system with several indoor units is generally more cost-effective than installing a separate single-split system in each room.
  • Heating and cooling from one system: Multi-split systems use heat pump technology, providing efficient heating in winter and cooling in summer from the same installation.
Wall-mounted AC indoor units in two rooms connected to one outdoor multi-split condenser

Types of air conditioning

Whether you’re looking for AC for a single room, an office, a school, or an industrial complex, we at Lux Cooling Group have the solutions for you. If you’ve been wondering ‘what type of air-conditioning is the best?’ then our handy guide has everything you need to know…

Cassette Air Conditioners

Cassette air conditioners are installed within the ceiling, leaving only a discreet grille visible. They distribute air evenly in multiple directions, making them ideal for larger rooms, open-plan spaces, and homes where a clean, unobtrusive appearance is preferred.
Cassette Air Conditioners

Ducted Air Conditioning Systems

Ducted air conditioning provides whole-home climate control through a network of concealed ducts. Air is distributed evenly throughout the property, while zoning options allow different areas to be cooled independently for enhanced comfort and energy efficiency.
Ducted Air Conditioning

Multi-Split Air Conditioners

Multi-split air conditioning systems connect several indoor units to a single outdoor unit. They allow independent temperature control in multiple rooms, making them a practical solution for homes that require flexible comfort without installing multiple outdoor condensers.
Multi-Split Air Conditioners

Window Air Conditioners

Window AC is most suited to those that are looking to cool a single room or a small area. As the name suggests, these systems are installed by a window or by making a hole in the wall.

Window Air Conditioners

Keep Your System Running All Year

Installation is just the beginning. We offer annual servicing and maintenance packages to keep your system efficient, extend its working life, and protect your warranty. Our engineers cover all of London and Essex and can respond quickly to any service call.

AC Maintenance Services
Lux Cooling Group engineer carrying out an AC service

Aircon Installation Across London and Essex

We carry out installations across London and Essex from our base in Loughton. For location-specific information, visit our London or Essex pages.

Explore other system types, see: Cassette Air Conditioners | Multi-Split Systems | Window Units | Duct Air Conditioning.

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London

  • All London boroughs
  • East and West London
  • North and South London
  • Central London

AC installation in London

Essex

  • Chelmsford, Colchester
  • Brentwood, Harlow
  • Basildon, Southend
  • All Essex towns

AC installation in Essex

Frequently asked questions about multi-split air conditioning

How many indoor units can connect to one outdoor condenser?
The number of indoor units a single outdoor condenser can support depends on the model and its total capacity. Most domestic multi-split systems support two to five indoor units. We assess the total cooling load and pipe run lengths at the survey stage to confirm the appropriate outdoor unit specification for your property.
Can each room have a different temperature in a multi-split system?
Yes. Each indoor unit operates independently and has its own controller, so the temperature in each room can be set separately. Rooms that are unoccupied can be switched off individually without affecting the other units, which helps to reduce running costs.
Is a multi-split system more expensive than separate single-split units?
The outdoor unit for a multi-split system is more expensive than a standard single-split condenser, but the overall cost of installing one multi-split system with multiple indoor units is generally lower than installing a separate single-split system in each room. There is also only one outdoor unit position to consider rather than multiple, which is a significant advantage on properties with limited external wall space.
Can the indoor units be different types in a multi-split system?
Yes. A single multi-split outdoor unit can support a mix of indoor unit types, including wall-mounted, cassette, and floor-mounted units. This allows the most appropriate unit type to be selected for each room depending on the ceiling height, room size, and aesthetic preference.
What is the maximum pipe length from outdoor to indoor unit?
Refrigerant pipe lengths vary by system and manufacturer, but most domestic multi-split systems support individual runs of up to 25 to 30 metres. We measure all proposed pipe routes at the survey stage and confirm they fall within the manufacturer specification before recommending a system.

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Trusted multi-split air conditioning installers in London and Essex

With over 20 years of experience, we install and maintain multi-split air conditioning systems across London and Essex. Free site surveys, transparent pricing, and a 1-year warranty on all installations. Get in touch and we will arrange a visit at a time that suits you.