General cleaning or chemical overhaul?
Updated
General cleaning is routine maintenance of accessible components and filters, with condition checks. Chemical overhaul involves more extensive cleaning and dismantling appropriate to the equipment.
Choose by condition, not just age
Heavy build-up, persistent odours or poor airflow may warrant inspection for deeper cleaning. These symptoms can also have other causes, so a technician should assess the unit before recommending work.
Ask what is included
Confirm which parts will be cleaned, access requirements and whether repairs or replacement parts need a separate quotation. Chemical cleaning alone does not repair electrical faults or refrigerant leaks.