I purchased my home in 2005. There is a popping noise coming from the the ceiling. The noise seems to be coming from around the windows near where the HVAC air ducts are located. Can anyone tell me what this noise is and how to fix it. I have a Bryant HVAC system and my repairman said he can not find anything wrong with the system. I looked in the access areas of the ceiling area and I could not see anything that causes this noise.