Bad Air Draft Problem
We have Simonton ProFinish Contractor Single Hung Windows and there has always been a really bad air draft (like a wind tunnel in bad weather) coming up the frame channel through the top of the Sash on all of the windows. I am thinking of replacing them but I thought I'd see if there was something that could be done to fix the problem first.
They are 10 years old and the weatherstripping looks good. Is there something I can have checked out prior to spending a lot of money on new windows?