With energy costs skyrocketing, homeowners are looking for ways to save money. One of the easiest ways is to use a programmable thermostat. It's estimated that doing so can shave about 10 percent off your annual heating and cooling bill. But not only are programmable thermostats good for your wallet, their efficiency is also good for the environment. Each properly used programmable thermostat reduces the use of 1,847 pounds of greenhouse gas emissions a year. So, why not use a programmable thermostat? Energy Star makes it easy with this page of tips and a video podcast on using a programmable thermostat. And installation is easy. renovateyourworld.com's Step by Step How To video, "Replacing a Mercury Thermostat with a Programmable One", shows you how.