Greater London · Air conditioning installation
Air conditioning installation in Harmondsworth
We cover Harmondsworth for supply, installation and commissioning of air conditioning for homes and businesses, from one room to a whole building. A look at the job first, a fixed-price quote and written records at the end.
- An ageing air conditioning system near the end of its life
- Portable units that are noisy and barely cope
- Rooms heated by plug-in heaters
Why act early in Harmondsworth
For homeowners, timing can matter for VAT: HMRC zero-rates the installation of energy-saving materials in homes until 31 March 2027, after which the rate becomes 5%. HMRC says most air conditioning units are air source heat pumps, but each case depends on the facts and we confirm the VAT on your quote. This is general information, not tax advice. Getting the work done in Harmondsworth before summer avoids the busiest weeks.
What you pay depends on the type of system and how many units are involved, how easy the units are to reach and what the work involves. We give you a fixed price before work begins, so there are no surprises.
Why us?
- A reply the same working day
- Members of Checkatrade
- Every job looked at before it’s priced
- Covering London and the South East
Take a look at our cost guide and how to check a contractor.
How we handle air conditioning in Harmondsworth
Single-room systems are typically £1,200–£2,200 + VAT, while a two-room multi-split is typically £2,800–£4,500 + VAT and three to five rooms £4,500–£8,500 + VAT. Those ranges include supply, installation, commissioning and F-Gas documentation, with commercial and VRF systems priced after a survey. Modern air conditioning heats as well as cools: the Energy Saving Trust notes that air-to-air heat pumps are sometimes called air conditioning, which is why many owners use theirs all year.
Planning permission isn’t usually needed for a house if the unit qualifies as permitted development, but listed buildings, conservation areas and flats often need consent first: we tell you at the survey if it applies.
In Harmondsworth, as across London, the rooms that get hottest are normally under the roof or behind large sunny windows. A single wall-mounted unit in the worst room is often where people start, while a multi-split serves several rooms from one outdoor unit, which helps where outside space is limited.
If a fault appears while the equipment is under the manufacturer’s warranty, tell us the make, model and installation date. We’ll explain how the manufacturer’s terms are likely to apply before anything chargeable is done.
- Place
- Harmondsworth (UB7, TW6)
- Wider area
- Greater London
- Credentials
- NICEIC approved, F-Gas certified
- Guide price
- One room: £1,200–£2,200 + VAT
- Quote
- Fixed after a survey or photos
- Telephone
- 07833 053749
- Page updated
- 30 October 2026
Honest limits
Before booking, it helps to know what’s not included:
- Draughts and missing insulation
- Damp from leaks or a lack of ventilation
- Work that needs permission from a landlord or the council
If in doubt, ring 07833 053749 or fill in the contact form and we will say what we think before booking.
What we work on in Harmondsworth
- Air-to-air heat pumps
- Ducted systems
- VRF systems
- Multi-split systems
- Wall-mounted split systems
- Ceiling cassettes
Places near Harmondsworth
Also in Harmondsworth
How the job changes from property to property
Pipework and condensate drains
After the pipework is fitted, the refrigerant circuit is pressure tested and evacuated, so the system starts life clean, dry and leak-tight. It’s recorded in the commissioning details.
Outdoor unit positions
Noise is part of the decision: away from bedroom windows and neighbours’ windows where possible and fitted so vibration doesn’t carry into the building. It can also affect whether planning permission is needed.
Air conditioning in Harmondsworth: local notes
London installs often hinge on outside space, the lease and access to the building.
Starting with one room is common, and the outdoor unit can be chosen with more rooms in mind. Around Church of St Mary, a quick check of the listing and conservation maps is part of planning any install.
Harmondsworth is about 1 mile south-west of West Drayton, in Greater London. Whatever kind of property you have in Harmondsworth, we can help with air conditioning. We reply to enquiries the same working day, and there’s a 24/7 emergency line. Count every place we list in Greater London and you reach 764, with Harmondsworth on the list. London, roughly 17 miles off, has its own page on this site.
The closest recent job we can point to from Harmondsworth was on Church Street, Staines-upon-Thames (TW18), about 4 miles south: installing two LG wall-mounted units in the main office area and a single unit in the client meeting room. More about it
We cover homes and businesses on Moor Lane, Hatch Lane and High Street and nearby roads. If your postcode is in UB7 and TW6, we can take the job on. We also cover the places around Harmondsworth: Longford (1 mile south-west), Sipson (1 mile north-east), Heathrow (2 miles south-east), Harlington (2 miles east) and Stanwell (2 miles south). We also work in nearby towns such as City of Westminster (14 miles east), Marylebone (14 miles east), Kensington (12 miles east) and Hampstead (14 miles east).
Local landmarks in Harmondsworth
Typical jobs here are in properties near Harlington Community School and The Five Bells Inn and the streets around them. Harmondsworth’s nearest station is Heathrow Terminal 5 Rail station, roughly 1 mile south of the centre. Other landmarks nearby include British Airways Heritage Collection (3.5 miles north) and Harlington (1.4 miles east). For a walk, there’s Crane Meadows and Staines Reservoirs.
How the visit works
Anything involving refrigerant is handled by F-Gas qualified engineers, as the law requires, and electrical work is done by us as NICEIC approved contractors. So on the day, you don’t need a separate electrician for the electrical side. On site, it takes anything from a day for one room to several days for a multi-room or ducted system. Photos of the room and where the outdoor unit could go let us plan most of a visit to Harmondsworth in advance.
- We survey the property, or work from your photos for a simple job.
- The system is sized, positions are agreed and the price is fixed.
- Sheets go down first, then the indoor unit and the condenser are mounted.
- Pipework, cable and drain are run, the circuit is connected and the pipework is pressure tested and evacuated.
- The system is commissioned, the controls explained and the F-Gas records handed over.
Before we arrive
- Mention any roof access, ladders or high-level work
- Let us know where the consumer unit is
- Unlock any gate, garage or side passage we need
Getting a price
Quotes don’t take long. Call or email with a few details and we will come back to you the same working day. If we need to see the property first, we book a survey at a time that works for you.
Advice
Questions from Harmondsworth
Is Harmondsworth in your area for air conditioning?
Yes. We work across London and the South East from our base in East Grinstead, and Harmondsworth is part of that. Tell us a little about the job and we’ll take it from there.
Can you fit air conditioning in a London flat in Harmondsworth?
In many cases, yes, once the lease and the building’s rules are checked. Permitted development rules for flats are tighter than for houses, so we check the outdoor unit position and give you the details to send to the freeholder or managing agent.
How do I know what size unit to get?
We size each room on the survey, from its size, glazing, orientation and use. An undersized unit never catches up, and an oversized one cycles and wastes energy and we explain the output we recommend.
Does air conditioning need its own electrical supply?
In most cases, yes: a dedicated circuit is needed. Under Part P, a new circuit has to be notified unless a registered competent person does it, and as NICEIC approved contractors we install and certify it as part of the job.
Do you have a 24/7 line?
Yes. There’s a 24/7 emergency line for breakdowns that can’t wait. Ring 07833 053749 any time and explain the problem.
Can you set up regular servicing?
Yes. Tell us what you have and how it’s used, and we will suggest a schedule with a fixed price. That can include the leak checks the F-gas rules require for larger systems.
Will I get records for the system?
Yes, on every job. A new system comes with commissioning details, F-Gas records and the manufacturer’s warranty information, while repairs and services get a written note of what was found and done.
From one of our customers
“Office air con broke down in the July heatwave. Called at 8am, engineer was here by noon and fixed within 2 hours. Brilliant emergency response. They now hold the service contract for the whole building.”
James T., Crawley, office manager