Noisy Pest in ducts

4560
Hello, It’s winter, but I appear to have a chirping/screeching/buzzing noise, usually in early morning, but lasts for hours, coming from my ductwork, which is embedded in foundation slab under house. Initially, it sounded more like a cricket/s, but now it sounds like a cicada/s. This commotion has been going on for weeks. I haven’t actually seen the insect yet, just heard it/them. The noise isn’t coming from the mechanical unit, but in a different section of the house far from the heating unit. What can I do about this problem? Maureen Fine, Bowie, MD

It’s pretty hard to identify a pest from a verbal description of a sound.  Our only suggestion is to have the ducts professionally cleaned.  There are businesses with large vacuums that specialize in this service.