A.
This really doesn't answer your question, but I thought this would be helpful... I had replacement windows put in by Castle about 10 years ago. Now I didn't really see a difference in the drafts, I thought is was just the way the house was and the windows were much nice than what we had. So the problem came when 2 years ago we put new siding on the house and found out that all the original window sills/casings (don't know what you call them) were uncovered and found to be dry rotted. (There would be the cause of my drafty house). The installers for the Castle windows knew there was a problem when they put in the replacements but never said anything and just covered it up. So for the 2nd time in 10years I bought new windows. I learned my lesson: Always make arrangements to be home when you are getting work done on the house, don't leave it to the neighbors!
Good Luck.