1. HVAC manufactures have moved to building proprietary computer controlled HVAC systems which must be serviced by a certified technician. This allows them to build a system of regional service companies who maintain complete monopoly over an entire region. Even if you wanted to open a shop to compete with the incumbent, you can't because the manufacturer wont allow you if another shop in your region exists. The result is gate-kept artificial scarcity of technicians and parts allowing for price gouging. The solution is right to repair and boycotting these clowns.

2. Roof work has always been a huge cost as it's very labor intensive (I learned some flat roof maintenance from a roofer friend.) The issue is we have not developed a roof system that works in conjunction with solar panels. Until that happens roofs and solar will be orthogonal problems no one wants.

3. My work got semi-screwed by this. They used concrete blocks, around 60,000 pounds worth, to hold down metal frames the panels were bolted to. Total bonkers fly-by night operation company disappeared after 2 years and we had to maintain it ourselves. Roof was destroyed after 7 years as it was leaking all over and several cracks formed in the blocks around beams. It was deemed unsafe and the entire 75kW system removed. Building owner spent $200k on a new roof and building repairs then banned solar from being installed again.

4. So is your fancy HVAC system. I believe that electrical generation should become part of a homes infrastructure just like HVAC. It enables authority and autonomy over energy which is something I have wanted. Though I also believe if someone wishes to surrender that autonomy then they should be allowed to do so.