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

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