Mild burning smell from the vents. Please advise
I just noticed that when the furnace is on I sometimes notice burning smell. Not sure what could be wrong. It's a new built townhome 2 year old. Changed filter recently. I am wondering what could be causing the burning smell . Note: I have not cleaned the ducts since I got the house...not sure if something in the duct is causing the smell due to heated air passing by.