You know the drill: you come home from work or hop out of bed in the morning and your house is a little cool. So, in order to heat your home quicker (you think), you crank the thermostat up way past 68 degrees. Well, friends, that little trick doesn't heat your home any faster. As it turns out, according to our friends at Greenwala, your furnace works hardest when it is first turned on, regardless of the temperature. All setting the temperature higher does is make your furnace work longer, causing your precious dollars to fly out the window.