HVAC is the worst job ever nothing but fat criminal drug addicted who spend all their money on scratchers and quads, and the pay will be comparable to electricians in your area. I’d only go to school for geology, chemistry, or botany. I was in the elevator industry and couldn’t get a union job because nepotism and any woman or minority got moved to the top of the list. It was entirely extended family with blacks around doing the jobs that can’t get anyone killed and you have to live in a major city.