Step1: Wear insulated gloves when handling electrical components.
Step2: Disconnect electrical power at breaker and check zero voltage with tester.
Step3: Remove cover panel and access old thermostat.
Step4: Label and carefully disconnect wiring.
Step5: Mount new thermostat securely in same position properly.
Step6: Reconnect wires as noted, tighten terminals.
Step7: Restore power and safely test temperature control; ensure safe operation.
Step8: check thermostat calibration per manufacturer specifications.