Even without a home energy audit, if your attic is cold and there’s no insulation between it and the floor below, you likely have an opportunity to save energy and money by adding insulation. It’s been estimated that if you beef up the degree of insulation in your attic from an R-11 rating to R-49, you might save about $600 per year — after only spending perhaps $1,000 to $2,000 on the job. Another estimate is that a properly insulated attic can lop 10% to 50% off a home’s energy bill. Sealing any air leaks in the attic is also well worth doing, and should be done before insulating the attic.