Since nobody has responded to this I will take a stab at it.
First, buy a used copy of Fundamentals of HVAC/R by Carter Stanfield and David Skaves. This is the standard text for anyone entering the trade in the US. It is well written and thoroughly vetted.
Second, read the above text from cover to cover, repeatedly, until you understand it.
Third, look into the HVAC program offered at your local technical school. Some are great (Carter Stanfield runs one somewhere here in GA). Some of them will simply take your money and waste your time. The program at our local tech school doesn't even prepare you for certification.
Fourth, find a reputable HVAC/R service company that will take you on as an apprentice.
Fifth, do not even think of doing this for money until you have your certifications and meet state requirements for a contractors license. You will be ratted out immediately by professionals who are doing more than just protecting their territory. They are protecting the reputation of an industry that already has a tarnished image.
Summary: None of the above may have been what you were looking for but they are they necessary steps to entering the field. If you are just looking to learn enough to work on your own AC then buy the book, read it, and peruse the threads here and on some of the professional forums.
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