Heating, Ventilation, and Air Conditioning (HVAC) thermostats use which of the following voltages fo

Heating, Ventilation, and Air Conditioning (HVAC) thermostats use which of the following voltages for control of the heating and cooling systems?

A.
5 Volts

B.
12 Volts

C.
24 Volts

D.
48 Volts