Is this book about Healthy Homes/MCS or Envrionmentally Friendly Homes or Energy Efficient Design? It tries to do all three and ends up doing none of them well.There is not much current information about toxic building materials/multiple chemical sensivity. If that is what you are looking for, Paula Baker Laporte and John Bower are much better choices.The case studies are outdated. Typical of architects, there are a bazillion architectural building details that you may or may not find useful. As a Home Builder, I found this book a waste of time and money.On the plus side, there is a lot information about water purification systems. It has the prettiest cover of any of the Healthy House books I have seen.