We have a absolutely odd smell coming from our ducts and I feel I’m just going to have to go ahead and call a professional heating and cooling company about it. At first, I honestly thought that I was imagining it. I thought that there was something yucky smelling outside and that it was getting in through the Heating plus A/C system and making the condo smell bad. Then the more I smelled it, the more I realized that it was honestly coming from inside the house. That’s because whenever I went outside to look for the source of the smell, the air outside smelled fresh and sweet! It was totally unlike the gross smell inside of the house! So I went back to trying to figure out what was causing the issue. Well, I did a lot of detective work and I got it narrowed down to the fact that it was definitely something inside of the air duct. I noticed that the smell got infinitely worse whenever the turned on. The smell was almost unbearable if I was sitting by a single of the air vents. I knew that there was something going on however I could never figure out what it was. It was almost to the point where I needed to open up the windows while the was on, which would be completely stupid! I am calling the local Heating plus A/C company this week to make an appointment with them. I feel I’m going to have to get our air ducts professionally cleaned out to get rid of this smell.