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I'll admit that when I get the "turn your AC off from noon to 3 pm" email at 8 AM, I go turn it down so that I can turn it off at noon.

I don't know if this thermal battery helps much.

For Austin Energy’s opt in thermostat management program they will precool the houses ahead of the “savings event”

It is a peak issue not a sustained issue during off hours so that can assist.