Mercury filled thermostats served their purpose in the past, but times have changed and digital programmable thermostats are the way of the future. With electric and gas prices skyrocketing, a digital thermostat will save you money. It will turn the furnace and air conditioner on and off automatically. The best part is they can be set for different temperatures at different times of the day. So if you are ready, let's install a digital programmable thermostat.
...Source: http://electrical.about.com/b/2014/01/14/install-a-digital-programmable-thermostat.htm
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