I am really skeptical about this. I think that it would depend on a lot of different factors. But I KNOW our bill is MUCH HIGHER when we heat our house at night. That includes turning it down and everything. We use SO MUCH MORE fuel by running the heater twice as much. We turn it off when we are going to be gone for more than a couple hours as well. We also live in a mild climate (pacific NW) so it might be a different story in North Dakota or Wisconsin...
My point is that this isn't true across the board. I know it's not true for us.
This kinda reminds me of the logic that you shouldn't turn off your car because it takes more fuel to restart it then to just let it idle. Not true if you are letting idle longer than 30 seconds or so.
Great article, though. We all need to learn how to save on heating costs this winter!! :
Like this article:
"3. Myth: Turning down your thermostat uses more energy because it has to work harder to make it cool/hot again once turn it back up.
This energy myth costs utility customers loads of money during the cold months. Turning your thermostat back (or purchasing a programmable thermostat that will do it for you) while you are away or asleep can only save you money, it will never cost you more. The explanation for this is a bit complicated, but the key points are that your home is much more resistant to heat loss than you may think, furniture and carpeting retain enough heat so that your furnace will not have to work that hard to raise back up to a comfortable temperature. The longer that the furnace is off, the more savings you will achieve because the energy used to reheat a space is always less than or equal to the amount of energy used to keep it at a consistent higher temperature"