To determine whether you should add insulation, you first need to find out how much insulation you already have in your home and where.
A qualified home energy auditor will include an insulation check as a routine part of a whole-house energy assessment. An energy assessment, also known as a home energy audit, will also help identify areas of your home that are in need of air sealing. (Before you insulate, you should make sure that your home is properly air sealed.
-U.S. Department of Energy
