I've also DIY installed 3 mini split units in the house -- the last one being an AC / DC unit that directly gets powered via 4 panels on the roof during the sunny moments of the day.
Built a new addition 3-4 years back. It's far better insulated than the main structure, but the wood stove and heat pump combo keeps winter mostly at bay.
Anything over 30 years is insane.
Either way, the memories!