To Heat or Not To Heat

Maintain a constant indoor temperature and you’re heating not just your home but also the great outdoors. Heat is constantly lost, especially through doors and windows; the warmer it remains inside, the more heat escapes. It’s a law of thermodynamics, the same principle that makes tank water heaters less efficient than on-demand models.

This is why it takes less energy to reheat a house in a short time than to keep it warm all the time, and why energy-conservation organizations like the American Council for an Energy-Efficient Economy estimate a 2% savings on heating bills for each degree you lower the thermostat for eight hours at a time.