[I make oil]

This is across the front. I have very large windows. Vinyl would never have worked on the front. I was trying to get my utility bills down. My house is over 5000 sq ft and was built in 1968. Not much thought went into efficiency. My previous windows were very good quality but not very efficient. The big picture window in the front is 10' X 5' and had to be specially made to fit.