Turn off your Trane air conditioning unit.
Open the filter door and pull the used filter straight out from the housing. Place a new filter in the housing. Close the filter door. Replace the Trane XL 1200 every six to eight weeks during the cooling season.
Rake any leaves and debris away from the outside Trane XL 1200 unit. Keep the area around the unit clear of plants and dirt.
Place 2 tsp. of dish soap on a cloth and run water over it to create suds. Wipe down the exterior of the Trane XL 1200 with the cloth to remove dust and dirt. Rinse off the cloth and wipe the unit down again to rinse off the suds.