Typical Homes Lose Up To:
10% through windows
15% through doors
15% through the foundation
25% through the roof
35% through un-insulated walls!

Nearly 25% of your home's wall is made up of studs that typically are not insulated, so it's like having one entire wall of your home with no insulation. Adding insulation to your home's exterior under new siding can help your home meet U.S. Department of Energy (DOE) insulation recommendations, as well as state and local codes. 

The DOE says, "When new siding is to be installed, it's a good idea to consider adding insulation under new siding."