I hadn't heard of / thought of the thermal storage idea (freezing ice at night - when it's more efficient both cost wise due to cheaper power, and thermodynamic

I hadn't heard of / thought of the thermal storage idea (freezing ice at night - when it's more efficient both cost wise due to cheaper power, and thermodynamically due to lower outside temperature - and then using that to reduce the need for daytime cooling), and it's so obvious in retrospect that it seems like it should be everywhere. Given what a huge amount of electricity is used on air conditioning (~6% of all electricity generated in the US, apparently), this seems like it could be pretty big.