Originally Posted By: Dignan
I've always wondered, what's the threshold for energy savings? I have to imagine that reheating a place in the winter after you've been out must take more energy than maintaining a constant temp. So I wonder how long you'd have to be out in order to make it worthwhile.

Didn't we discuss this upthread? I still reckon that, unless you've got a heating system that's more thermodynamically efficient at low outputs (eg heat pump), letting the place cool even briefly is a saving in energy, as the heat loss to the outside air is highest when the temperature difference is highest.

Peter