I do have a 7/4 programmable thermostat, which would be great if I left the house on the same schedule every week. Instead, I'd like a button I can hit on my way out the door that sets it to 45°F for eight hours. This could be achieved with a switch and a timer in series with my programmable thermostat, and if necessary, a nonprogrammable thermostat in parallel, set to 45°F. File that under "interesting circuit, not worth building".
Christ, thanks for sharing that info about cold starts. A friend of mine got a new thermostat with a programmable temperature range, and now I know why.
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