Hello, here is my problem, These windows were installed in 2006, I did not have them put in so the only info I have is they are vinyl windows. I have had my whole house insulated in 2007. I thought I felt a small amount of air around my 2 bedroom windows so I hung small fleece blankets in them kind of like curtins. next morning there was some condensation and ice built up on them. about an hour after removing the blankets it was gone. it has been between 5-20 above degrees when I did that. what should I do?