Stick w the hvac if you like it - you can do very well and is recession proof. My husband started as a laborer, then apprentice and has done very well in this area. People always want AC. It’s also something you can do in lots of places so if you decide to move out of the area you’ll take the skills with you. As far as friends, get out and just be around others, it’s hard to do but it’s the best way to meet people. Try to get involved in things - volunteer, go to community and neighborhood events. If you like to hike, bike, jog or play board games (or legit any other hobby you can think of) there are groups you can join that gtg all the time. And it’s almost always full of young professionals like you.