Keep airflow clear
Check filters and keep supply and return openings unobstructed. Outside, keep normal vegetation and debris from crowding the equipment.
Watch drainage and icing
Water where it should not be, repeated icing, or abnormal shutdowns are not routine maintenance items to ignore.
Schedule service when needed
Professional AC maintenance can check operating condition and identify issues that require tools or access beyond normal homeowner tasks.
Safety note: If you smell gas, see smoke or fire, suspect carbon monoxide, or believe there is an immediate safety danger, leave the area as appropriate and contact the relevant emergency or utility service. Do not treat an active safety emergency as a routine HVAC appointment.