Insulating new windows with drywall returns

I have a 1983 home with original aluminum metal gliding windows. Lots of windows and pretty big. We are looking to replace them with Marvin Essential series Casements. Our plan… I have a 1983 home with original aluminum metal gliding windows. Lots of windows and pretty big. We are looking to replace them with Marvin Essential series Casements. Our plan…Read MoreGreenBuildingAdvisor