Air conditioning systems need regular maintenance to run efficiently, last longer, and keep manufacturer warranties valid. For London properties, an annual service is the minimum — commercial systems used year-round benefit from biannual servicing.
Maintenance is the complement to a good air conditioning installation — the two together determine the long-term value of your system.
What an Annual AC Service Includes
| Check | Why it matters |
|---|---|
| Filter clean | Dirty filters reduce airflow, cut efficiency, and can cause icing |
| Evaporator and condenser coil inspection | Fouled coils reduce heat exchange efficiency significantly |
| Refrigerant pressure check | Low refrigerant indicates a leak and reduces cooling performance |
| Condensate drain flush | Blocked drains cause water leaks inside the property |
| Electrical connections check | Loose connections cause failures and are a fire risk |
| Full operational test | System tested in cooling and heating modes |
How Often Should AC Be Serviced?
Residential systems used seasonally: once per year, ideally in spring. Office and commercial systems in continuous use: every six months. Server rooms may require more frequent checks given the critical nature of the environment.
Maintenance and Manufacturer Warranty
Most AC manufacturers — including Daikin, Mitsubishi Electric, and Fujitsu — require evidence of annual servicing to honour warranty claims. A skipped service can void your warranty.
What If a Fault Is Found?
If our engineer identifies a fault during a service visit, they will advise on repair options and costs. For systems beyond economic repair, we provide quotes for a replacement installation.
Frequently Asked Questions
How much does an AC service cost in London?
A full annual service for a single-unit residential system costs £150–£200. See our cost guide for full pricing context.
Can I service my own AC?
Filter cleaning can be done by the owner. Gas checks and electrical work require an F-Gas certified engineer.
What happens if refrigerant is low?
Low refrigerant indicates a leak. We locate and repair the leak, then recharge the system — see our repair service for details.
Book Your Annual Service
Book a service or enquire about a maintenance contract: 020 7870 2333. We cover all London zones including Central, North, West, and South West London.
Simply Air Conditioning London — F-Gas certified installation, servicing and repair since 2009.
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