Thanks for the info! Definitely not looking to do door to door or outbound sales calls, just know there’s people around here who will go into houses and tell you all the ways you can improve energy efficiency, then hook you up with technicians to do the work.
Inspection, appraisal and estimating all sound like solid choices too. Just seem more complicated to get into. We have government programs and testing here to become a certified EA, just starting to do research now.