The cost of air conditioning installation in Leicester depends mainly on the size and make of the unit, how many rooms you want to cool, how far the pipes run to the outdoor unit and whether your fuse box can take a new circuit. A single wall-mounted unit through an outside wall is the simplest job. Multi-room systems, long pipe runs and high outdoor positions cost more. A fair quote names the unit and lists everything included.
Prices at a glance
| Job | Typical price | Time |
|---|---|---|
| Single split unit, around 2.5kW, indoor and outdoor units back to back | Fixed price per job | Usually 1 day |
| Single split unit, 3.5kW or more, with a longer pipe run | Fixed price per job | Usually 1 day |
| Multi-split: two indoor units on one outdoor unit | Fixed price per job | Usually 1–2 days |
| Dedicated electrical circuit, where not already in the quote | Fixed price per job | Usually done the same day |
| Condensate pump, where the drain cannot fall by gravity | Fixed price per job | Fitted during installation |
| Annual service, single unit | Fixed price per job | Usually a short visit |
What affects the cost of installing air conditioning?
Five things set most of the price: the unit itself, the number of rooms, the pipe route, the electrical connection and how easy the outdoor position is to reach. The extras around the unit are what make two quotes for the same room look so different.
Before you compare prices, check that each quote covers the same job. One installer may include the circuit, trunking and a wall bracket; another may list them as extras.
- Unit size and brand
- Bigger and premium units cost more to buy.
- Single or multi-split
- More indoor units means more pipework and more time.
- Pipe run and outdoor position
- Long runs, upper floors and awkward walls add cost.
- Electrical circuit
- Most units need their own circuit from the fuse box.
- Wall and drainage
- Thick or hard walls and pumped drains take longer.
Does the size and brand of the unit change the price?
Yes. A larger unit costs more, and premium brands cost more than budget ranges of the same size. Most bedrooms suit around 2.5kW, while bigger living rooms and rooms with lots of glass often need 3.5kW or more. Buying a bigger unit than the room needs does not help: it costs more and cools in short bursts.
Brand tier affects more than the price tag. Premium ranges tend to have higher efficiency ratings, quieter indoor units, better Wi-Fi apps and longer manufacturer warranties. Many manufacturers only honour their full warranty if the unit is installed by an F-Gas certified company and registered, and some ask for regular servicing too, so read the terms.
Look at the seasonal efficiency figures on the label: SEER for cooling and SCOP for heating. Higher numbers mean lower running costs for the same output. Your quote should name the make, model and kW size, so you can check these yourself.
Is a multi-split cheaper than separate single units?
Not always. A multi-split runs two or more indoor units from one outdoor unit, so you only have one box on the outside wall. But the outdoor unit is larger and dearer, every indoor unit needs its own pipe run back to it, and the job takes longer.
Separate single splits are often similar in total cost and have one big advantage: if one fails, the other rooms still work. A multi-split makes sense when wall space outside is limited, when planning or a lease only allows one outdoor unit, or when the rooms sit close together. We will price both options if your rooms suit either.
How do the pipe run and outdoor unit position affect the cost?
The shortest, simplest route is the cheapest. The ideal is a back-to-back install: indoor unit on an outside wall, outdoor unit directly behind it, with one hole between them.
Each metre of extra pipe means more copper, insulation, trunking and time. Most units leave the factory with enough refrigerant for a set length of pipe, often stated in the installation manual. Beyond that, extra refrigerant has to be added and recorded, which adds cost.
The outdoor unit's position matters too. Ground level on a stand or a low bracket is easiest. A first-floor bracket can usually be fitted from ladders, but higher positions or flat roofs may need a tower or other access equipment, which is priced separately. Remember the unit also needs airflow, a drain route and space to be serviced later.
Does air conditioning need its own electrical circuit?
Usually, yes. Most split units need a dedicated circuit from the consumer unit, with an isolator switch near the outdoor unit so it can be safely serviced. A new circuit is notifiable work under Part P of the Building Regulations, so it must be tested, certified to the current Wiring Regulations (BS 7671) and notified to building control.
The cost depends on your fuse box. If it has a spare way and modern protection, adding the circuit is straightforward. If it is full, very old or has no RCD protection, it may need upgrading first. If the board itself needs replacing, Norman will tell you plainly before anything is agreed.
Many air con installers have to bring in an electrician for this part, which can mean a second visit or a second bill. Norman is an electrician as well as an air conditioning installer, so the circuit is done on the same visit and covered by the same fixed price.
Why does F-Gas certification matter, and what paperwork should I get?
Anyone who installs or handles refrigerant on a split system must be F-Gas certified, and the business must hold company certification. This is a legal requirement under the GB F-Gas rules, not an optional extra. Sales of pre-charged split units for self-installation are also restricted, so a cheap 'fit it yourself, we'll connect it' offer is a warning sign.
Rushed pressure tests and vacuums are a common cause of slow leaks later. You can check an installer through the F-Gas certification bodies' public registers.
- Electrical installation certificate
- For the new circuit, plus building control notification.
- Commissioning record
- Pressure test, vacuum and refrigerant details.
- Warranty registration
- Ask whether the installer registers it or you do.
How do wall type and the condensate drain affect the price?
The pipes, cable and drain go through one core-drilled hole, usually about 65mm across. Standard brick or block is routine. Thick solid walls in older Victorian terraces, stone, or concrete take longer to drill. Cavity walls need the hole sleeved and sealed, and timber-framed or rendered walls need extra care around the membrane and finish.
Cooling takes water out of the air, and that condensate has to go somewhere. The cheapest route is gravity: the drain falls through the wall to a gully, downpipe or soakaway. If the indoor unit is on an inside wall or below the drain point, a small condensate pump is needed. It adds a little cost and a little noise, so a good quote says up front whether one is included.
How much does air conditioning cost to run and service?
Running costs depend on the unit's efficiency, the room's size and insulation, how many hours you use it, the temperature you set and your electricity tariff. We do not give a running-cost figure, because it varies too much from home to home. You can estimate it yourself from the unit's rated power use and your own tariff.
Modern split units are heat pumps, so they also heat the room. In mild weather that is often a more efficient way to heat a single room than a plug-in heater, though output falls in very cold weather.
Budget for an annual service. It usually covers cleaning the filters and coils, clearing the drain, checking pressures and looking for leaks. Most single domestic units hold a small refrigerant charge that falls below the threshold for legally required leak checks, but servicing still keeps efficiency up and may be a condition of the warranty.
How do I compare air conditioning quotes?
Put the quotes side by side and check they describe the same job. The lowest figure often leaves out the circuit, the trunking or the drain.
We price every installation as one fixed price, from your photos or a survey, agreed before work starts. If something unexpected turns up, such as a full fuse box, Norman stops and shows you, and nothing extra happens without your approval.
- Make, model and kW size
- Named, not just 'a 3.5kW unit'.
- Pipe length included
- And what happens if more is needed.
- Outdoor position and bracket
- Wall bracket, ground stand and any access equipment.
- Electrical work
- Circuit, isolator, certificate and notification.
- Drain route
- Gravity or pump, and where it discharges.
- Making good and warranty
- Hole sealed, trunking finish, warranty terms.
Questions
Can you price air conditioning from photos?
For a single unit, usually yes. Send photos of the room, the outside wall where the outdoor unit would go, and your fuse box with the cover open. Multi-room systems and awkward pipe routes are often better priced after a survey visit.
Does air conditioning in a garden room cost more?
It can. The installation itself is similar, but the garden room needs a suitable power supply from the house. If the existing cable is too small or unprotected, upgrading it is priced separately. Your photos of the garden room's fuse box help us check.
When is the best time of year to book an installation?
Spring and early summer are sensible. Demand for air conditioning tends to jump during heatwaves, which can mean longer waits for installers and some models. Booking before the hot weather gives you more choice of dates and units.
How long does a split air conditioning unit last?
It depends on the quality of the unit, how hard it works and how well it is maintained. With annual servicing and clean filters, a good split unit can be expected to run for many years. Neglected units tend to lose efficiency and develop leaks sooner.
Do I need permission to fit air conditioning in a flat?
Usually you need consent from the freeholder or landlord, and planning rules may apply, especially in conservation areas. In Leicester, that is the city council; outside it, your district council. Get permission in writing before booking, as it can affect where the outdoor unit goes.