Home Cold Reservoir

First, I'll mention that this was inspired by the "home icehouse" idea.

This would be a thermally insulated tank of water, with just enough antifreeze mixed in to bring its freezing point slightly below 0F. There would be tubes of antifreeze running through it, and tubes of refrigerant running through it.

Every night, a heat pump (refrigerator) would be run, moving heat from the tank to the atmosphere until the tank is completely frozen. This takes advantage of the cool night air, and the (sometimes) lower cost of electricity at night.

To make use of the cold reservoir, antifreeze loops run from the tank to your freezer and refrigerator, and for summer cooling, and to air handlers in either a central location or in each room in the home. (Or through a radiant heating/cooling system in your floors; however, you'd have to be careful not to cool your floors below the dew point, or else you'll get condensation)

Obviously, you'd want a tank that can store enough cold/frozen water so that once the system shuts off in the morning, it will provide for all your home cooling needs until late the next evening.