NOTE:Before attempting any maintenance on your AC unit, power the unit off and unplug it from the electrical receptacle.
Check the air filter at least twice a month to see if cleaning is necessary. Trapped particles in the filter can build up and block the airflow that can reduce cooling capacity and cause an accumulation of frost on the evaporator.
To clean the Air Filter
Pull the inlet grille forward.
Remove the air filter from the front grille by pulling the air filter up slightly.
Wash the filter using lukewarm water below 104°F (40°C).
Gently shake away excess water from the filter, allow it to air dry, and reinstall the filter.
To ensure continued peak efficiency the evaporator coils (inside behind front grille) and condenser coils (outside of the unit) should be checked periodically and cleaned if they've become dirty or clogged with soot.
Cleaning the coils.
Evaporator Coils: Remove the front grill, use a brush attachment with a vacuum cleaner to clean up any dust or debris that has made it past the air filter. If you are cleaning the coils after the air conditioner has already been running, put the unit in fan mode for about an hour in order to allow any condensed moisture on the evaporator coils to dry.
Condenser Coils: If possible, use a brush attachment with a vacuum cleaner to remove any dirt or debris that has build up from the outside. If using the vacuum isn't an option, you can also use a hose pipe to clean the condenser coils. Remove any garden sprayer attachments and allow the water to flow directly from the end of the hose down over the coils to wash away dirt and debris.
NOTE: The fins are sharp so take care when cleaning them. Do NOT bend the fins. If this happens accidentally you can purchase a fin comb from a local hardware store. The fin comb can be used to straighten any bent fins.
When it comes to keeping the case of the AC looking new and clean, just follow these simply guidelines.
Cleaning the Air Conditioners Case:
The front grille and inlet grille may be wiped with a cloth dampened in a mild detergent solution.
The cabinet may be washed with mild soap or detergent and lukewarm water.