Programmable thermostats are excellent for conserving energy in the home. According to the US Department of Energy website, homeowners can save $180 a year using such thermostats.
Energy Star-grade thermostats allow you four pre-programmed settings: (wake, day, evening, sleep). The point is to have automatic settings so that you conserve heating and cooling energy in the times (or seasons) when you don't need it as much.
Check out the Dept. of Energy's guidelines for tips on maintaining your thermostat.
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