Views:
  1. Ensure all mains are turned off for the HVAC system.
  2. Remove the thermostat casing.
  3. Remove all wiring connected to the thermostat.
  4. Carefully remove the thermostat, ensuring the holder is not damaged.
  5. Install the new thermostat into the holder.
  6. Connect the wiring with the thermostat.
  7. Ensure that the new thermostat works.
  8. Ensure that the HVAC system works.