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First, turn off the power at the electrical panel.
Then, remove the face plate and batteries of the existing thermostat.
Next, disconnect the control wires with a small screwdriver. Once the wires are disconnected, remove the back plate of the old thermostat.
With the old one removed, install the new thermostat by attaching the new back plate and screwing it into place. Check to make sure that it’s straight with a level.
Attach the control wires to the new unit. Follow the color coded guide to ensure proper wiring. Add the batteries and snap the face plate back on.
Follow the manufacturer's instructions for any additional specifications.