Our heating and cooling forced air system initially emits an odor after sitting idle for a couple of days. The house is 40 years old; furnace and AC replaced 10 years ago. If the AC is off for a day or two it has a ?musty? smell when first turned on requiring all the windows to be opened for about half an hour to clear. We cleaned all the registers, removed and cleaned the blower, put bleach down the drain line, removed the de-humidifier and vacuumed out the plenum. The insides are dry, drip pan is dry and clean and the coil looks relatively clean. We also replaced the electronic air filter with a dry paper type. The smell is emitted from each register yet we could see no evidence of any mold growth and could not smell any unusual odor when the furnace was first opened. The smell cannot be detected if the AC is cycled ever day. We read the pros and cons about the benefits of duct cleaning and don?t know if that would help or not? Any recommendations would be greatly appreciated.
- posted
19 years ago