I was called out to the house because there was a bad smell coming from one of the supply vents. I used my camera to look inside several of the supply vents and did not find the smell. I investigated in the crawlspace and found there is a lot of rodent activity as well as snake skins inside the insulation between the floor joist. I recommend having Complete Animal Removal come out and assess the situation and give a proposal to eradicate animals located roughly for dead rodents. I removed them which got rid of the smell. The ductwork on the main floor is in need of a cleaning. A proposal for duct cleaning, air, purification, and a protection plan will be emailed.