[Marsymars]

I'm not the one to whom you asked the question - I can think of plenty of things, but by and large most of the home things with ROI make the most sense to invest in when you're buying a new thing anyway - e.g. solar panels when you need a new roof, EV when you need a new car, ventless dryer when you need a new dryer, heat pump when you need new heating/AC, etc.

Off the top of my head the only thing that's really doable without replacing a depreciating asset are certain kinds of insulation upgrades. (And I guess potentially ceiling fan installs.)