Having rodents in the ductwork can cause a number of problems.
Unfortunately, it’s hard to know there is an issue until you have a problem. My wife and I found out the hard way that we had rodents in the ductwork. We were sitting in the living room one night watching a movie on the television. It was a quiet scene in the movie and my wife and I heard a scratching sound above our head. The sound was coming from the ceiling. My wife was immediately worried that we had mice in the ceiling. I told her that the issue was probably a loose screw in the ductwork. The next morning, I tried to find the problem. I decided it was a better idea to call a company that specializes in ductwork problems. The ductwork company technician was only in our home for a short amount of time when he told us that we needed an exterminator. He used a camera to view down many of the ductwork passages and found several mice. My wife and I called a pest control service and they had to come out on three different occasions to eradicate the problem. After the mice were completely gone, we had to call the ductwork cleaning company to get rid of all the mice droppings. The whole ordeal was enough to make me buy a ductless HVAC system and closed down the ducts for good. It was a disgusting problem and we spent a thousand dollars getting rid of those pests. The exterminator told us the problem wasn’t even severe!