While laws have changed, insulation itself really hasn't. The fiberglass and blown-in insulation used today are very similar to the kind used 15 years ago, Fritch said. New home buyers aren't the only ones concerned with adequate levels of insulation. Benson said many owners of older homes wonder if they have enough. About 20 percent of homes built before 1980 are considered to be well insulated.
Insulation helps create a more uniform temperature and can eliminate that problem.
Build a new home or addition or add new siding. Have excessive energy bills. Are bothered by noise from the outdoors - insulation can help block out sound. The government has also developed guidelines about how much insulation you should have depending on where you live. The guidelines are based on the insulation's R factor.