The short answer
For most UK homes a reverse-cycle split system is the best home air conditioning: it cools in summer, heats efficiently in winter, and runs quietly. A single split (£1,500–£3,000) suits one key room; a multi-split (£3,000–£6,000+) covers several. Planning permission is usually not needed within permitted-development limits, but siting rules apply. Installation must be done by an F-Gas-certified engineer.
Adding air conditioning to a home is now common as UK summers warm, but the choices — type, size, cost, planning, running cost — can feel daunting. This guide pulls the practical decisions together in one place so you can plan with confidence and brief an installer well. It is an overview that links to deeper guides on each question, from sizing to servicing.
Home air con at a glance
- Best all-round Reverse-cycle split (cools & heats)
- One room Single split, £1,500–£3,000
- Several rooms Multi-split, £3,000–£6,000+
- Running cost ~15–25p/hr for a 2.5 kW split
- Planning Usually permitted development, with limits
- Install F-Gas-certified engineer only
Choosing the right system for your home
The best home system for most people is a reverse-cycle split: it cools the room in summer and provides efficient heating in the cooler months, all from a single quiet wall unit. The choice then comes down to how many rooms you want to cool. Pick a single split for one key room such as a bedroom or home office — the simplest and cheapest fixed option — and a multi-split if you want several rooms served from one outdoor unit while keeping the building tidy. Renters, or anyone needing only occasional cooling, may be better served by a portable, which needs no installation. If you are building or renovating, a concealed ducted system gives the cleanest finish. For the full menu of options see types of air conditioning.
What it costs to buy and run
It pays to separate the up-front cost from the ongoing running cost, because air conditioning is often cheaper to run than people assume.
- Single split: £1,500–£3,000 installed.
- Multi-split: £3,000–£6,000 or more, depending on the number of indoor units.
- Portable: £300–£600, with no installation cost.
- Running cost: a typical 2.5 kW split draws about 0.6–1.0 kWh per hour when cooling — roughly 15–25p per hour at a unit rate near 25p/kWh.
- Servicing: about £80–£150 per unit per year to keep it efficient and the warranty valid.
| System | Best for | Installed cost |
|---|---|---|
| Single split | One room | £1,500–£3,000 |
| Multi-split | Several rooms | £3,000–£6,000+ |
| Portable | Renting / occasional | £300–£600 |
| Ducted | Builds / renovations | Project-specific |
Planning, the law and your landlord
For most homes a domestic external condenser is permitted development and does not need a planning application, provided it meets the limits on size and siting — for example, not being installed on a wall facing a highway above certain heights, and keeping clear of boundaries. Extra conditions apply in conservation areas and for listed buildings, where consent may be required. See do you need planning permission for air con. Separately, GB F-gas law requires that the refrigerant system is installed, commissioned and serviced by an F-Gas-certified engineer working for an F-Gas-registered company; DIY refrigerant work is illegal. If you rent, get the landlord’s written permission before any fixed unit is fitted, as it involves drilling and an external unit.
Getting it right
Two things make the difference between a system you love and one you regret: correct sizing for the room, and a quiet, well-sited outdoor unit. An undersized unit never catches up on a hot day, while an oversized one short-cycles and wastes energy, so insist on a proper survey rather than a guess. The survey should account for the room’s size, its window area and orientation, how many people use it and any heat-producing equipment, all of which add to the cooling load. Check the energy rating before you buy so running costs stay low over the years — see most energy efficient air con. For bedrooms, prioritise low noise levels; for living areas, even airflow. Think too about where the outdoor unit will sit so it is unobtrusive, well-ventilated and not directly under a bedroom window where its hum might carry. A good installer will walk through all of this with you before quoting.
Done properly, home air conditioning delivers efficient, quiet, year-round comfort — cooling in summer and heating in winter from one tidy system. Start by deciding how many rooms you genuinely need cooled, then read how it cools a room and book a proper installer survey before accepting any quote.
Planning home air con?
Decide your rooms and budget, then book a survey with an F-Gas-certified installer to confirm sizing, siting and a firm quote.
Frequently asked questions
What is the best air conditioning for a home?
For most homes a reverse-cycle split system — a single split for one room or a multi-split for several — because it cools, heats and runs quietly and efficiently.
Do I need planning permission for home air conditioning?
Usually not for a domestic external unit within permitted-development limits, but siting rules apply and conservation areas and listed buildings have extra conditions.
How much does home air con cost to run?
A typical 2.5 kW split draws about 0.6–1.0 kWh per hour, roughly 15–25p per hour at a unit rate near 25p/kWh, depending on use and settings.
Can I install home air conditioning myself?
Only a sealed portable. Any fixed system contains fluorinated refrigerant and must legally be installed by an F-Gas-certified engineer.
Sources & further reading
- Energy Saving Trust — home cooling and air-to-air heat pumps
- gov.uk — Planning Portal guidance on domestic air conditioning units
- gov.uk — GB F-gas regulations on installing and servicing systems
- Ofgem — energy unit rates and efficient electricity use
This guide is general information, not a site-specific survey or a substitute for a quote from an F-Gas-certified installer. Installation, servicing and refrigerant handling are legally restricted to F-Gas-certified engineers.