Suzanne asked: I have one room that was an addition to my house. Previous owner had the garage made into a room. The air conditioning smells so must. It comes out of two vents in the ceiling. I have had the unit serviced and keep the filter clean. The unit is in a small attic off the master bedroom. Any ideas? Thanks
If a musty odor is coming from the air conditioning, it means that there is mold, mildew, slime or other growth somewhere in the unit. There are two key places to check when trying to locate the source of the problem. The first is the unit itself, which is located outside. The second is the air handler which is located in the house somewhere. The air handler is typically located in the attic or basement and contains the air filter that is changed frequently.
Once the air handler is located, check to ensure that the water is draining properly from the condensate drain. A good time to check this is after the air conditioner is turned off on a humid day. If there is mold or growth present, it may help to add a small amount of bleach to the drain pan and drain line. There are special cleaning sprays available to clean the evaporator coils. Once the growth is removed, the smell of the air should freshen.