EcoRenovator - View Single Post - Does cooling your house down at night really save energy?

Ryland · 12-03-10, 08:11 AM

You also need to remember that if you have cooler air going in to your furnace to be heated that it's going to be able to pull more heat out of the furnace heat exchanger, so in theory at least your furnace is going to be more efficient with cooler air going in.
At work we have a modern coal stove, it has a bin like a pellet stove that you fill with 50 pound bags of coal, there is also a programmable thermostat and I can see the change in fuel use over the course of a few days if I turn the night temp down to 47F instead of 50F, with a day time temp of 55F, I don't have solid numbers on it but it's clearly using less fuel and the fuel used to warm up isn't all that great compared to the fuel used to keep it warm.

12-03-10, 08:11 AM	#4
Ryland Master EcoRenovator Join Date: Mar 2009 Location: Western Wisconsin. Posts: 913 Thanks: 127 Thanked 82 Times in 71 Posts	You also need to remember that if you have cooler air going in to your furnace to be heated that it's going to be able to pull more heat out of the furnace heat exchanger, so in theory at least your furnace is going to be more efficient with cooler air going in. At work we have a modern coal stove, it has a bin like a pellet stove that you fill with 50 pound bags of coal, there is also a programmable thermostat and I can see the change in fuel use over the course of a few days if I turn the night temp down to 47F instead of 50F, with a day time temp of 55F, I don't have solid numbers on it but it's clearly using less fuel and the fuel used to warm up isn't all that great compared to the fuel used to keep it warm.