[header] How to install a digital thermostat [title] Purchase a digital thermostat from a home improvement or hardware store. [title] Turn off the power to your furnace before beginning digital thermostat installation. [title] Remove the cover of the old thermostat. 
[substeps] Most of them simply pop off easily with a little force. [title] Remove the screws from the screw terminals in the sub-base of the old thermostat and remove it from the wall.