F-Gas registered engineer servicing an air conditioning unit

Air conditioning servicing, maintenance and repair

We service, maintain and repair air conditioning systems across Surrey, Berkshire and London, whoever installed them. A service keeps a system efficient and legal; a maintenance contract does that for a business without anyone having to remember; and when something fails, we get an F-Gas registered engineer to you fast. This page tells you which one you need.

Reviewed by Harry Lee, Director, HT Cooling Ltd (F-Gas registered company, certificate 2004080) · Last checked 23 September 2026

Request a quote 03453 022 969

Which page do you need?

If your system is working and you want it kept that way, you need an air conditioning service. Filters, coils, drains, refrigerant pressures and a leak check, with a record for your file.

If you run a business with several systems, or a building where cooling matters — an office, a shop, a server room, a restaurant — you need planned maintenance. Regular visits on a schedule, the paperwork kept for you, and priority when something goes wrong.

If it has stopped working, is leaking, is making a noise it did not make before, or is blowing warm when it should be cold, you need air conditioning repair. Call 03453 022 969 and we will tell you how quickly we can be there.

We service systems we did not install

Most of the systems we look after were fitted by someone else. If you have a Daikin, Mitsubishi Electric, Samsung or any other major brand and the installer has gone quiet, we can take it on. We will tell you honestly if a system is worth repairing or is near the end of its life.

Why servicing matters

A system that is not serviced loses efficiency, costs more to run, and fails sooner — usually on the hottest day of the year. For businesses there is a legal side as well: systems above a certain size must have their refrigerant checked for leaks on a schedule, by a registered engineer, with records kept. Our inspections and F-Gas page explains what applies to your building.

Our servicing & repair pages

Air conditioning servicing

A full service for home or business systems

Air conditioning repair

Breakdowns, leaks, noises, warm air — fast call-out

Why people choose HT Cooling

Every engineer who works on refrigerant is F-Gas registered (certificate number 2004080). We hold Constructionline Gold, SMAS Worksafe and Acclaim accreditation, and our engineers are City & Guilds trained. We are rated 5.0 on Google from 50 reviews, with 66 reviews on Checkatrade, where we have been members since 2021. We are based in Lightwater, Surrey, and work across Surrey, Berkshire, Hampshire and London.

Questions people ask

Once a year for a home system. Twice a year for a business system that runs most of the day, and more often for a server room. Systems above a certain refrigerant charge also need leak checks by law — see our inspections page.

It depends on the number of indoor units and how accessible they are. We quote a fixed price before we come.

Yes. We repair all the major brands. If we cannot get a part, or the system is not worth repairing, we will say so and give you the options.

Yes. Call 03453 022 969. Tell us what the system is doing and we will tell you how quickly an engineer can be with you.

Where we work

We cover Surrey, Berkshire, Hampshire and London from our base in Lightwater. See all the areas we cover, including Woking, Guildford, Camberley, Bracknell, Ascot, Windsor, Richmond and Chelsea.

Talk to an engineer, not a call centre

Call 03453 022 969 or send us a few details and we will come back to you the same working day.