AC service and cleaning at home: general clean, deep wash and gas top-up explained
By J-Guard Services · Updated 4 November 2026
An air conditioner that is cooling weakly or pushing up the electricity bill usually needs servicing, not replacing. Knowing the difference between a general clean, a foam deep-clean and a gas top-up tells you what to actually book — and what you don't need.
General cleaning vs deep cleaning vs gas filling
AC servicing is not one job. There are three distinct things a technician can do, and you pick what the unit needs — per AC.
- General cleaning: the routine service. The filter, evaporator coil, blower and drainage tray are cleaned and the outdoor condenser is dusted, then cooling is checked. Right for a unit serviced within the last year or so.
- Deep cleaning: for heavily used units. The indoor unit is bagged, foam is applied to the coil and internal parts, and a controlled-pressure wash lifts out clogged dust a general clean cannot reach. Right when airflow has dropped or there is an odour.
- Gas filling: only when cooling is genuinely weak. The technician inspects for leaks and repairs them, vacuums the system, charges refrigerant (R32, R410A or R22 to suit the unit) and tests cooling. Topping up gas without finding the leak only defers the problem.
How to tell what your AC needs
- Cooling has dropped gradually, with dust or a musty smell → a general or deep clean, not gas.
- Water dripping indoors → usually a blocked drain, cleared in a service, not a gas issue.
- Cooling has dropped sharply and the unit runs non-stop → have the refrigerant and leaks checked.
- Higher electricity bills at the same usage → often a clogged filter or coil, fixed by a clean.
What a good AC service includes, whatever the option
Before any work, the power is switched off and the unit's condition is checked; electrical parts are kept protected from water throughout; and cooling is tested again at the end. Regular servicing improves cooling, cuts electricity use, and clears the dust and odour that build up quickly in a hot, humid climate.
How often, and how it is priced
A home AC is usually serviced once or twice a year, and before summer is the sensible time — demand and waiting times both climb once it turns hot. Servicing is priced per AC and you choose the options you need; a leak repair or gas charge is quoted after the unit is checked, since a partial refill costs less than a full one.
Common questions
How often should a home AC be serviced?
Once or twice a year for regular use, ideally before summer. Units that run most of the day, or in dusty areas, benefit from a deep clean more often.
Does my AC actually need a gas refill?
Only if cooling is genuinely weak and a leak check points to low refrigerant. Weak cooling is more often a clogged filter or coil, fixed by a clean. A technician checks before charging gas, and a partial top-up costs less than a full charge.
What is the difference between general and deep AC cleaning?
A general clean covers the filter, coil, blower, drain tray and outdoor condenser. A deep clean bags the unit and foam-washes the coil and internal parts under controlled pressure, for heavily used units where dust has clogged the system.