According to the U.S. Department of Energy (DOE), the typical family spends close to $1,500 each year on energy bills. The DOE states that homeowners may be able to reduce their energy bills from 10% to 50% by taking certain steps, the most important being increasing the amount of thermal insulation in their existing home, or purchasing additional insulation when buying a home.
Unless your home was constructed with special attention to energy efficiency, adding insulation is very likely to reduce your utility bills overall. However, the amount of energy you conserve will depend on the size, shape, and construction of your house, as well as the heating and cooling system you use. Overall, energy conserved is money saved.