I installed a smart thermostat today, upgrading from an older manual model. After shutting off power to the HVAC system, I carefully labeled and disconnected the existing wiring, then mounted the new wall plate and connected the appropriate wires to their designated terminals. I configured the smart thermostat to work with the home's specific heating and cooling systems, connected it to the home's WiFi network, and walked the homeowner through the basic features of their new device. I also helped set up the mobile app and demonstrated how to create custom schedules for optimal energy savings.