Every homeowner should read the following for relevant background information about the science behind retrofit techniques and materials as well as for important health and safety information:

• Section 1.4, Health and safety considerations
• Chapter 2, "How your house works"
• Chapter 3, "Materials"
• Chapter 9, "Operating your house"

Read other chapters as required for specific details. Improving energy efficiency is an ongoing process, accomplished bit by bit as you work on your house over the years. Keep this book as a handy unbiased reference.

Where more details could be helpful (e.g. information about heating systems and health concerns), we refer to the various sections of our website.