A properly working thermostat can give your home better efficiency in both heating and cooling that cannot be achieved otherwise. No matter how well your furnace or air conditioning unit is rated, without a good thermostat you may as well throw your money out the window. Thermostats can give you an option to time your heating and cooling systems which will give near instant savings if properly set. If your thermostat is either not properly registering the temperature or not switching your systems off and on, you may be looking at either extremely high bills or living in a constant state of discomfort.