Air Conditioning Maintenance Guide UK: DIY and Professional Service

Why maintenance matters

Air conditioning is low-maintenance, but it is not no-maintenance. A little care keeps the system working at its best, which means lower running costs, cleaner air and a longer life from the unit. Neglect it and the opposite happens: the system works harder, uses more electricity, cools less well and wears out sooner. Regular servicing also keeps your warranty valid, so it protects the investment as well as the comfort.

The good news is that some of it you can do yourself in a few minutes, and the rest is a straightforward annual visit.

What you can do yourself

Clean the filters

This is the single most useful thing you can do. The indoor unit has washable mesh filters behind the front flap that catch dust and hair. Over time they start to clog up, which restricts airflow and makes the unit work harder for less cooling. To clean them, open the front cover, slide the filters out, rinse them under the tap or vacuum them gently, let them dry fully, and slot them back in. It takes five to ten minutes. In heavy use, monthly is about right, and less often when you are barely using the system.

Keep the indoor unit clear

Wipe the front of the unit with a dry or slightly damp cloth now and then, and keep furniture and curtains from blocking the airflow. The unit needs a clear path to move air around the room.

Keep the outdoor unit clear

Check the outdoor unit every so often and clear away leaves, grass cuttings and debris. Keep plants trimmed back so air can flow freely around it. A blocked outdoor unit is one of the most common causes of a system running poorly.

Run it now and then

Running the system occasionally in both cooling and heating, even out of season, keeps everything moving and helps you spot any problem early rather than on the first hot day.

What needs a professional

The annual service

Once a year the system should be looked at by an engineer. A service covers the things you cannot safely do yourself: checking the refrigerant charge and pressures, inspecting the electrical connections, cleaning the coils and the condensate drain, testing the controls, and giving the unit a deeper clean than a filter rinse. Because the refrigerant circuit is sealed and regulated, this work has to be done by an F-Gas certified engineer, which all of ours are. A service typically costs in the region of £80 to £120 for a single unit.

Signs something needs attention

Book an engineer if you notice any of these:

Most of these are minor if they are caught early, and more expensive if they are left.

Servicing and your warranty

An annual service is not just good housekeeping. It keeps your 5-year warranty valid, and it is the cheapest way to avoid a bigger bill later. We offer annual servicing so you do not have to remember, and we will remind you when it is due.

If your system is due a service, or you have noticed any of the signs above, get in touch for a quote and we will sort it. Our guide to running costs explains how a well-maintained system keeps your bills down.

Air conditioning maintenance: common questions

How often should I clean the filters?

Monthly when you are using the system a lot, and less often when you are barely using it. It takes a few minutes and makes a real difference to airflow and running costs.

Do I really need an annual service?

Yes. It keeps the system efficient and reliable, catches small problems early, and keeps your warranty valid.

Can I service it myself?

You can and should clean the filters and keep both units clear. The sealed refrigerant system has to be serviced by an F-Gas certified engineer, so that part is not a DIY job.

What does a service cost?

For a single unit, usually in the region of £80 to £120. We confirm the price before booking anything.