Hit and miss,
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This review is from: Converting to an Eco-friendly Home: The Complete Handbook (Paperback)
This book was published in 2008 so in some respects events have overtaken it: gas and electricity are considerably more expensive than when it was written and some of the technologies and solutions have become considerably cheaper and more mainstream. Having said all of that it's an interesting if inconsistent book.
There are some good ideas and suggestions in the book and there is both theory and practical advice. However in some places there are glaring errors that should not have made it through the editorial process - for example the definition of a Joule is plain wrong.