content: Definitely. As a passive system that's a much better option. You could even just go closed-loop heat transfer using water as a medium. On the one hand it's not passive (since you have to pump the water) but on the other hand it still uses very little power and is hugely more versatile.  Upgradable capacity just by using a bigger storage tank Add a solar heat absorber for cheap solar heating Add a heat exchanger in a nearby body of water or evaporative outside cooler for additional cheap cooling