I had new heat and air installed last July, everything was fine until October. I didn't use either heat or air for a month, and then I turn on the air and it smells TERRIBLE. Like a moldy musty smell comes out of the vents. So I get the HVAC guy out here and he checks the vents, it doesn't smell bad at the return vents or the delivery vents.
He takes off the exhaust pipe from the furnace and it doesn't smell bad. But you can somewhat smell it when you remove the blower motor. Where is the smell coming from?!!? This is a mobile home so you can't clean the ducts. It has been 9 months and the smell is just as bad as it was when it happened sometime in October. Oh and you can ONLY smell it when the fan or air is turned on, for some reason you can't smell it when the heat turns on.
Please help! I am trying to sell the mobile home and I can't have the home inspector smell the musty odor coming out of the vents.