It’s a Myth that turning down your thermostat when you leave the house ultimately uses more energy because the furnace has to work extra hard to make the house warm again once you turn it back up. The Truth: Don’t be left out in the cold on this myth, because it isn’t true. According to Conservation Consultants Inc., 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. 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 heat a room back up to a comfortable temperature.