[nimos]

Been curious if you can't do this with houses generally. Set a temperature range of say 21-25c. Drive the temperature up when there is excess wind/solar (was primarily thinking of EU) then let it fall off.

Obviously works better the better insulated a house is. Has the advantage of turning everything in your home into a thermal battery with the only real cost being furnace controller, potentially even just software. At one point I meant to do the math to figure out the rough storage/efficiency for an average home but never got around to it.

[darkerside]

Real estate is precious. You really want a massive heat battery taking up a lot of living space?

[nimos]

I'm not suggesting adding anything. Homes have lots of stuff in them. Everything in your house becomes a thermal battery - tables, chairs, beds, walls, counters, clothes and so on. Just allow a range of temperatures and when energy is very low cost drive the indoor temperature to the upper range.

Ideally you have a brick/stone home with good exterior insulation.

[darkerside]

Sure, I do that sometimes. The effect rounds to zero, but better than nothing?