The furnace will overheat. The thermostat will become hot. The furnace will automatically turn on. The thermostat will give off a beeping sound.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: What happens when the temperature in the house is cooler than the temperature selected on the thermostat?
Possibilities:
- The furnace will overheat.
- The thermostat will become hot.
- The furnace will automatically turn on.
- The thermostat will give off a beeping sound.

The furnace will automatically turn on.