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Heat Pumps are one of the subjects my students have the greatest difficulty understanding well. This book has helped me provide them with another perspective and furnished me with an additional resource to guide them through the certification process.
The controls section of this book needs to be updated, but 90% of the book is still relevant. The text tends to lag behind the images, but this book is packed with a ton of helpful information and plenty of pictures. If you're a mechanic and you're working with older equipment, maybe this book is exactly what you're looking for. This is the second book that I bought by Mr. Brumbaugh, and I noticed there's a little over lapping, but still, this book is a few bucks and what you'll get out of it is worth it.