A UK air-conditioning maintenance contract is a planned F-gas visit plus filters, checks and a named call-out route, not a cheap sticker. 2026 cost illustrations for a single split often sit in a low three-figure annual band. Commercial plant is priced per system, access and attendance hours. Price the engineer, not the PDF.
Contract versus a one-off service
Facilities teams want a number they can budget. A contract should state visits per year, what is inspected, whether refrigerant leak checks are included, response times, and what is extra: parts, out-of-hours, TM44. A one-off summer clean is cheaper on day one and leaves you hunting an engineer in a heatwave.
F-gas leak-check frequency depends on charge and gas, not on whether you bought a gold package. If the contract skips statutory leak checks, you still own the duty. Read the schedule. Domestic households with one or two splits often need a simple annual visit, not a corporate SLA. Commercial sites with cassettes, kitchens and server rooms need attendance that matches dust, grease and criticality. The servicing cost guide and the maintenance contracts guide sit alongside this page.
- State visits, leak checks, response times and exclusions in writing.
- Filter-only is a clean, not a contract.
- Server rooms and kitchens should not share a domestic price list.
What 2026 illustrations look like
Treat these as illustrations, not a national tariff. A straightforward single-split house visit can land in a low three-figure annual band once travel is included. Two to four indoor units push it up. Commercial contracts are usually priced per indoor or per outdoor, with access equipment extra. London parking, roof permits and night working move the number more than the oil in the compressor.
If a quote is dramatically cheaper than local peers, it is often filter-only: no leak check, no electrical inspection, no condensate test. Server rooms and close-control should never share a domestic price list. Critical cooling needs spares logic and call-out, not an annual wipe.
What should be on the visit sheet
Filters, coils, condensate, electrics, operating pressures or superheat as appropriate, outdoor clearances, and a written note of defects. Refrigerant type and charge recorded. Recommendations dated. If you never receive a report, you did not buy maintenance.
Who holds keys, loft hatches and roof access should be in the contract. A missed visit because nobody knew the alarm code is not the manufacturer's fault. Sky Air and Mr Slim commercial splits still need this discipline. Brand pages are not a substitute for attendance.
Buying without over-paying
Ask for the engineer grade, not the account manager. Ask whether leak checks are included at the legal interval. Ask what happens on a Friday 4pm failure. Compare that, then compare price.
Do not sign a five-year contract on day-old plant without a break clause. Do not skip maintenance on ageing plant and then blame the installer for a seized fan. We can introduce maintenance-capable installers. We do not sell contracts from this page. Use the quote form.
Frequently asked questions
Is a maintenance contract legally required?
The contract itself is not. F-gas leak checks and, where they apply, TM44 inspections are legal duties. A contract is how most owners discharge the practical work.
How often should a house split be serviced?
Annually is a common UK pattern for a lightly used living-room unit. Kitchens, server cupboards and heavy summer use may need more. The manufacturer's schedule is a starting point, not a legal maximum.
Does maintenance cut running costs?
Dirty filters and blocked condensers raise electricity use and shorten compressor life. A visit will not rewrite a bad design, but it stops avoidable waste.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.