Base the interval on real use
Operating hours, dust, cooking residues, occupancy and the importance of the room all affect the schedule. Manufacturer instructions and warranty requirements should be checked for the specific equipment.
Many households choose regular annual attention, while heavily used commercial or customer-facing systems may need more frequent visits. The interval should be reviewed if conditions or usage change.
User care and professional servicing are different
Homeowners may be able to clean accessible filters by following the manufacturer instructions and isolating equipment safely. That useful routine task is not the same as a broader service visit.
Servicing can consider accessible heat-exchange surfaces, drainage, visible condition, controls and operation. If a separate fault is found, diagnosis, parts and repair should be explained rather than silently treated as routine maintenance.
Records help on multi-unit sites
Businesses and properties with several systems benefit from an equipment list and visit records. This makes it easier to connect observations and recommendations to the right indoor and outdoor units.
Some larger systems can also have statutory inspection or F-gas-related obligations. The UK Government publishes current guidance on air-conditioning inspections and F-gas responsibilities; the applicable rules depend on equipment and charge size.