Windows on Washington wrote:
The supremely low temps coupled with higher humidity levels could create that issue.
If the windows are over 20 years old, you are probably well suited to not invest any additional money and start looking at replacements.
Have you tried Window4U?
Thanks for the reply. I was fearing that was going to be the answer.
Dave has already installed OKNA 700 casements in my house! These were the remaining "good" windows on the first floor. Looks like it's time to give him a call after I get my tax return.