I have a quasi-passive solar home (from the early 80s) that I’m looking to optimize, and so have been researching a bunch of solutions. The most clever build I’

I have a quasi-passive solar home (from the early 80s) that I’m looking to optimize, and so have been researching a bunch of solutions. The most clever build I’ve found is from Resystech (ie some guy in Canada), who built a heat collector off his solar panels and then built a duct switch to either pump hot air directly into this house or, if not quite hot enough, to duct it through his heat pump. His build video is here: https://m.youtube.com/watch?v=dmckigvz7Hg https://m.youtube.com/watch?v=dmckigvz7Hg