Digital Controls for HVAC Technicians (Indoor Environment Technician's Library) Paperback – October 18, 2008

The book is extremely short (about 90 pages) and the pages are very small (actually the book itself is very small), and it quickly refers you to a basic book within their library as a pre-requisite to understand this book better. I dont understand why it promotes itself as learning material in a specific subject, but doesnt include the basics (but they do claim to have the bare-bones of the basics included). I dont think the price matches the size and substance included in the book. I will admit it is well structured and well written.