Getting into the Heating and Air Conditioning field?

I was thinking about getting into this kind of work, but I don't really know about getting into it. Can I do some kind of on the job training/internship or would I have to go to some sort of college for a job. Almost every place that does this type of work are looking for people, but only people with work experience in the field. I live in syracuse ny and would like something in the area if I would have to attend some college or cles, i have no experience at all in the field