Adding insulation to the attic is relatively easy and very cost effective. To find out if you have enough attic insulation,
measure the thickness of the insulation. If it is less than R-22 (7 inches of fiber glass or rock wool or 6 inches of cellulose),
you could probably benefit by adding more. Most U.S. homes should have between R-22 and R-49 insulation in the attic.
Check
your location on the climate chart below (courtesy of the Department of Energy):
Now check your zone on the DOE chart below. These are the RECOMMENDED levels of insulation based on
climate and fule costs. Theses values may not be the same as local building codes.
