HVAC ain't my biz, but I love science and y'all seem like good people to learn from.
My interests lie not in HVAC per se, but more in the transfer of heat (as in transferring it outside of my house). Started on this road as part of a computer project involving me & my son that made me notice "Heat Islands" in the home. These areas of heat concentration left me wondering if small scale heat pumps would work, and if so could the average Joe do something that would have a positive economic impact, i.e.- live more comfortably, or reduce his utility bills.
It's been fun. I've relearned a lot of the science I'd forgotten. I've learned more from other fields than I'd ever imagined (engineering, materials, geology) I would have. And interestingly enough, I've met with some success in some small scale trials.
But my hopes are to detail means by which others that are less economically advantaged than I can improve their lives and/or, save money. If I don't, well, I still find science a great way to relax.