Air conditioning was hitting a major stride at this time in this book is how to design the built up refrigeration system to work for instance an air handler or how to build up a custom sized maybe even variable sized system this goes into all aspects of what to look at and why along with enthalpy charts in the back fold of the book this is a mandatory book for any engineer or anyone who’s into designing refrigeration systems is there so much extra information added here for you to look at as putting together something please take a look at the pictures and ask any questions you might have thank you for looking.