Turn off your air conditioner and access your air handler unit. The air handler is inside your home, probably in the attic or with your furnace, if you have central heat.
Open the air handler's access door with the wrench or screwdriver. Locate the overflow pipe. It will be a pipe that drains into a pan under the evaporator on the inside of the air handler. The evaporator looks like a prism.
Open a window in the room with the air handler. Place a funnel in the access hole of the overflow pipe. Plug the other end of the pipe. Pour 1 cup of bleach into the access hole slowly. Allow the bleach to sit in the pipe for two to five minutes.
Unplug the bottom of the pipe and allow the bleach to flow into the drain pan. Rinse the pipe with clean water. Dispose of the bleach in the drain pan.
Close the access door and turn the air conditioner back on.
Things You Will Need
- Screwdriver or wrench
- 1 cup bleach
- Wear rubber gloves when working with bleach.