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Clean your air conditioner occasionally to keep it looking new. Be sure to unplug the unit before cleaning to prevent shock or fire hazards. Air Filter Cleaning The air filter should be checked at least once a month to see if cleaning is necessary. Trapped particles in the filter can build up and block air from flowing to cooling coils and cause an accumulation of frost on the cooling coils. • On models with Fresh Air Vent Control, push in control to vent closed position. • Open the front panel.