Reddit reviews Modern Refrigeration and Air Conditioning
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Used Book in Good Condition
The EPA is the agency that requires any technician who handles CFC and HCFC refrigerants to be certified. There are 3 levels: type I, II, and III + the core. You need to pass the core and at least one of the 3 levels to get certified. If you pass all 3, you get a universal certification and can pretty much work on anything. The exam itself is issued by approved vendors and proctored at numerous schools and supply houses. You will probably need to get it at some point, but without at least some experience/knowledge in the field, it may be a bit difficult to understand. You can always find/purchase a study guide and take a crack at it.
There are numerous ways to enter the field. Since you have some sales/customer service experience, you might try getting a job at a supply house. This will expose you to what the industry is like. You can also see if they might have any leads for contractors looking for laborers or apprentices.
You also have to keep in mind that this is a pretty diverse field. What are you interested in? Residential HVAC? Commercial refrigeration? Industrial maintenance? Automotive? Appliance repair?
I recommend picking up a copy of Modern Refrigeration and Air Conditioning. It is pretty much the defacto standard textbook for the trade. Good luck!
Modern Refrigeration and Air Conditioning. https://www.amazon.ca/Modern-Refrigeration-Conditioning-Andrew-Althouse/dp/1590702808