Sealing and Insulating your home is one of the most cost-effective ways to make a home more comfortable and energy efficient—and you can do it yourself. Use This Guide To: 1. Learn how to find and seal hidden attic and basement air leaks 2. Determine if your attic insulation is adequate, and learn how to add more 3. Make sure your improvements are done safely 4. Reduce energy bills and help protect the environment