Final answer:
A wi-fi thermostat cannot be used to disconnect the main power supply to the conditioned air equipment while away from home.
Step-by-step explanation:
A wi-fi thermostat allows homeowners to control the temperature and settings of their thermostat remotely using a smartphone or computer. However, there are certain tasks that cannot be accomplished with a wi-fi thermostat. One of these tasks is disconnecting the main power supply to the conditioned air equipment while away from home. This is because the wi-fi thermostat only controls the settings and temperature of the thermostat itself, not the power supply to the equipment.