So we should probably do the thermal imaging. Hoping this can be done this time of year.
Then I feel like we need a good HVAC person who is willing to get to the bottom of everything. It seems like most people are so busy in the winter though. Not sure how to find someone with the time, patience and expertise. I'll just have to get researching!
You are all very helpful, thank you. My husband was so surprised that there were people nice enough to respond.
FYI...........winter is the slow time for most HVAC guys. Weird I know, but true. If you can't find someone NOW, it'll be totally impossible in 5-6 months.