I remember a while back there was quite a foul stink coming from my air conditioning every time I turned it on. I was afraid that some sort of pest had gotten into the system and was leaving droppings or urine, and perhaps something had even died in the air vents! Well I wasn’t prepared to go investigating myself. I wasn’t sure at that point whether I should call pet control or an HVAC dealer, because the stink actually was funky and I strongly suspected pests were responsible, dead or alive. I ended up settling on calling out an HVAC dealer, and the HVAC company was able to come out to my household rather quickly, which I was grateful for. To my relief, she found that pets had nothing to do with the awful odor emanating from my HVAC system. Still, there was an awful stink, but it was because of a leak in my system that was letting water collect in the HVAC box. This water was dirty and contaminated and was emitting a strong odor. The HVAC company managed to patch the leak and wash up the water and I can finally not breathe an awful stench every time I turn on my AC! So the awful stink and having to deal with it was a mild inconvenience, however I am honestly blissful that that’s all it was and I didn’t have to deal with some sort of nasty vermin making its nest in my air vents or just dying someplace inside the HVAC system!