Heat rises, and when it does you better hope your attic is properly insulated to keep all that warmth from escaping your home. The Department of Energy advises that a properly insulated attic can reduce your energy bills by 10 to 50 percent. Consider insulation as your first defense against energy loss. It reduces airflow and prevents drafts that suck warm air out of a home. There are many types of insulation, including loose fill, batt, fiberglass blankets, and cotton. Do your research to determine which type of insulation will be best for your home and how much you'll need for your climate and house type.