Refrigeration and Air Conditioning 

Introduction  The Basics refrigeration how Air conditioning works how Air conditioning works #2
how refrdgerators work refrigerant types Geothermal savings on AC cost to run AC per btu
absorption chillers Handbook of AC&Refridgeration bes702 index and items  Chiller terminolgy   refridgeration and Airconditioning course
 refridgeration 101 (book)  Commercial AC (book)  part1 fundamentials of refridgeration  (book)


part 1 fundimentals ( book)   
 charging   How chillers work