[westmex]

Do you mean a 'Heat Sink' or a 'Heat Pump'. Don't think a Heat Sink would do much of anything for a house no matter where....I don't have a heat pump, but some people up here do.....

[AZLiberty]

No, a heat sink -- or at least heat storage -- is a good idea. When I was at TI back in the '80s they installed big underground water reservoirs to store chilled water at night when electricity was cheap and then use if for cooling during peak periods during the day. Bank One Ballpark here in Phoenix uses a similar scheme.

For consumers who decide to make use of it, you can get electricity for 4 cents a KWH off-peak vs. 16 cents on-peak. If you cool your house down a few degrees extra in the morning (at 4 cents), you can survive with the air conditioner off most of the afternoon (at 16 cents). I haven't heard of any individuals installing water reservoirs, however.