Our windows were installed in our new custom built house 7 years ago. We finally had to change every window in the house this month because of cold air coming into the house every winter. When the new window installers took out the Sunrise windows we saw that Sunrise did not put in any insulation. No wonder my rooms were cold!
When I called Sunrise Windows the first winter they told me I was wrong and just imagining the cold coming through the sides of the windows.