Multi-split air conditioning across Cornwall
Multi-split is a good fit for Truro flats and maisonettes where only a balcony or one rear wall is available. Twin and triple systems suit Truro homes where bedrooms sit above the kitchen and one rear wall can take the outdoor unit. South West summers are milder on the coast, but sheltered towns and south-facing rooms still overheat, and efficient winter heating matters just as much.
Prices in Cornwall
Budget around £2,450–£7,750 for 2–4 rooms including VAT for multi-split air conditioning in and around Cornwall. That is broadly in line with national guide prices. What moves a quote in Cornwall up or down is mostly pipe length, how high the outdoor unit goes, and whether a new electrical circuit is needed. As an example, the Triple option (three rooms with mixed indoor styles and Wi-Fi control throughout) would typically be £3,350–£5,450 here.
Twin
Two rooms on one outdoor unit, wall-mounted indoor units, standard routes.
Triple
Three rooms with mixed indoor styles and Wi-Fi control throughout.
Quad
Four or five rooms, longer concealed runs or a ducted unit in a loft void.
Guide prices show VAT at 20%. HMRC treats most fixed air conditioners and air-to-air heat pumps installed in homes as energy-saving materials, zero-rated until 31 March 2027 when we supply and fit them. If your installation qualifies, your quote shows 0% VAT and a lower price. Servicing, repairs, cleaning and controls are charged at 20%.
Planning and permissions
For most houses in Cornwall, the outdoor unit is permitted development if it passes the MCS 020(a) noise check (37 dB(A) or less at the nearest neighbouring window) and stays within the size and number limits. We run that check on survey.
The survey
A survey in Cornwall usually takes one to two hours. We measure the rooms, check the walls and the consumer unit, agree the outdoor unit position with you and photograph the pipe routes. On a survey in Cornwall the engineer looks at room size, glazing, the route for pipes and drains, the electrics and where the outdoor unit can sit quietly, then the written quote follows.
What is included
Included with multi-split air conditioning across Cornwall:
- Pressure test, vacuum and refrigerant charge calculated for the pipe lengths
- One outdoor unit sized to the combined load
- Commissioning and a walk-round of every room's controls
- Planned pipe routes through lofts, floors or trunking
- Free survey with a room-by-room heat-gain check
- An indoor unit and controls for every room
Towns in Cornwall
Pick your town for local details, or see every service in Cornwall.