Hi. I have a confusing problem that I cannot figure out. Sorry about the long post. Any help would be appreciated. I have high velocity A/C. Unit works fine in the summer, no issues with cooling. I live in NH. 1-2 years ago I noticed some water staining on the ceiling next to an A/C port...

I need advice regarding two options to retrofit air conditioner in our 80 year old house (no existing ducts). Here's a bit about our house - 2200 sq ft, 3 bedrooms and office on 2nd floor, half attic space is a finished bedroom and half is unfinished (plan to leave it this way), basement is...