Presumably most buildings are painted. My house for example. If painting it white saves %10 of my energy costs in the summer, how is that anything but a net pos

Presumably most buildings are painted. My house for example. If painting it white saves %10 of my energy costs in the summer, how is that anything but a net positive? BTW, I’m in the market for a new roof. I’m going white painted metal. Are double pane windows, solar panels, and insulation also gadgetry hype?