Very interesting Matt- very good points, it sounds like you're on to something with this. I only recently started learning how to identify coolants and fix fridge and auto units. The fridge I fixed was an awesome deal for an awesome newer sidebyside in immaculate condition, and just needed a section of line replaced on one side, and a recharge.
The theory behind heatpumps, ac, fridges, etc is so simple though, just like an aircompressor how pressure relates to heat (or the lack thereof). It's so interesting how one might try to further relate pressure and/or heat to light and sound too.
Matt, I'm assuming these newer minispits are very high eer and would not be as reliable in the long run? I do like how much lower of temps they can be efficient though! I wonder if they're more efficient on the other end of the temp scale as well?
Items high on my list in that category:
Get and learn brazing tools and technique.
Make an air compressor from a fridge compressor.
Also, make a genny head from a washing machine motor, but that's not hvac.
Oh, and figure out the best heating (and possibly cooling) system for a large (15000 cubic ft) and a small area ~100 cubic ft, especially if natural gas isn't readily available (or invest in a gas well? hahah). Latest thought was outdoor wood fired hydronic, mixed with solar passive, mixed with active solar hydronic.
I avoid it as much as possible
Well yes of course dustNbone lol! I was just thinking freely (and aloud) to deeper conclusion, after veering into modern Hvac and the rather intangible/indirect theory of how it could pertain to basic overall population 'wellness'. Btw, 'indigent' was somewhat accurate (had to look it up), but I kinda meant more 'indigenous' I guess.