I work in the HVAC industry in Austin. Not as a tech, but I work with techs often. All of them are extremely smart and resourceful. You'll use many different tools, techniques, and thought processes for this job. It encompasses all three MEP trades. They are some of the handiest people I have ever met.

If you go residential, you will spend lot's of time in attics with the Air Handler or outside with the Condensing Unit. You'll learn a lot very quickly and then apply that same knowledge repeatedly many times. Not glamorous, but it is much easier to get a job starting out in residential. All of the commercial techs I know started out as residential, then moved on up. In the commercial world, you are consistently learning about different units (most start at rooftops and work their way up to chillers & VRF). Additionally, there is a whole world of Control techs - that is it's own ball of wax. I can provide more controls info if you are thinking about that path.

Overall, HVAC is a great industry to get into. You will learn extremely applicable skills and never be mentally or physically bored (except if you stay in residential too long). The money is good; not amazing but you can make a very comfortable salary for yourself. 3MATX has spot on advice as well. I wish I could give you advice on being a female in the industry, but I really do not want to try to put myself in their shoes. Just be aware there are very few female techs, and you should seek out someone else's firsthand advice about that. Don't be afraid to ask me anything more specific!