Air conditioning cleaning costs in the UK split into three jobs people confuse: homeowner filter vacuuming, a proper F-gas maintenance visit with leak-aware checks, and a deep indoor clean with coil and blower attention. 2026 illustrations might show a light clean in tens of pounds DIY, a professional maintenance visit in the low hundreds for a single split, and deep cleans varying with access and contamination. Pay certified engineers for refrigerant circuit work, not for every wipe of a plastic filter.
Three different services
Filter cleaning is basic hygiene: wash or vacuum return filters so airflow and coils stay healthier. Many handbooks expect the occupant to do this. A full service adds outdoor coil care, electrical checks, performance readings and F-gas leak obligations at the legally required interval for the charge. A deep clean targets mouldy blowers, stubborn indoor coils and drainage, sometimes with specialist gear and indoor dismantling.
Marketplace ozone or fog treatments without opening the indoor properly are theatre if the blower wheel stays furry.
- Filters: frequent, often DIY.
- F-gas service: certified company, written report.
- Deep clean: when smell, slime or blocked drains appear.
- Commercial grease sites need tougher indoor schedules.
2026 cost illustrations
Treat as illustrations, not a tariff. DIY filter care is consumables and time. A straightforward annual service on one domestic single-split often sits in the low hundreds depending on region and travel. Multi-splits and cassettes cost more. Deep cleans that need significant dismantling can approach or exceed a service visit. London access multiplies call-out minimums.
Contracts that only leave a sticker without readings are not maintenance.
When not to pay for the wrong visit
Do not pay deep-clean prices for a five-minute filter pull. Do not let an uncertified handyman open the refrigerant circuit. Do not skip leak checks on larger charges because someone sprayed fragrance in the fascia.
If the system is R410A or R32 and needs recovery, that is F-gas territory per GOV.UK certification guidance.
How to book the right thing
Describe smells, drips, error codes and last service date. Send indoor photos with the cover open if safe. Say whether you want filter-only, full service or deep clean.
Use the quote form. Ask them to state which of the three jobs they are pricing.
Frequently asked questions
Can I clean the filters myself?
Usually yes on domestic wall units: power down, remove washable filters, dry fully before refitting. If you are unsure, ask the installer to show you once.
How often should a house split be serviced?
At least annually for many homes. More if you run it hard, keep pets, or notice odour. Leak-check intervals follow F-gas rules for the charge.
Is a deep clean the same as a gas top-up?
No. Deep clean is hygiene and drainage. Refrigerant handling is separate certified work. A system that needs frequent top-ups has a leak.
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.