[VaSteve]

I got a couple of those digital programmable thermostats for Christmas. The instructions give no indication as to what the largest drop you can have during the day and still heat back up by evening without really messing with the economy of the whole thing.

Right now I have a 4 degree drop during the day while I'm not home. I figure there has to be a point where the furnace is working double duty to catch up to the nice "when I get home temp".

Anyone have any data or anecdotal information?