Installing a programmable thermostat was the best $50 I ever spent on my house.

This simple device has consistently lowered my heating and cooling bills every month since installation.

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That "consistently lowered" part is the real trick. The thermostat itself doesn't save a dime if you just program it for your existing schedule. The savings only come from actually reducing runtime, like letting the house drift while you're at work. Most people I know just end up overriding the program constantly.