I need to learn more about the refrigeration side of things...I have been avoiding it for too long!!
     These were my exact words earlier this year.
     So, I started out watching a few You Tube videos explaining the principles,
 then I stumbled on this website: 
 http://epatest.com/  although I know there are a few others similar. 
    Within 2 weeks I not only learned the basics but got my EPA 608 certification to legally purchase and dispose of refrigerants. 
    Total cost was about $25.00, everything is done on-line, material is easy to understand, plenty of practice questions and open book exams.
    I would highly recommend this course to anyone who likes to work on their own machines. (it's also simply a feather in the cap for us old guys)    
