I've thought about electrician and HVAC a bit. However, a friend pointed out that going to college and switching to electrician down the road would be much easier than becoming an electrician now and trying to do school later when we might have children. So trade type jobs with apprenticeships/short schooling aren't my main focus right now.
Already planning on retiring early, I've just haven't been doing enough planning on the income side. Saving 50+% of zero doesn't get you very far.