Hi I am changing the thermostat for my baseboard heater (tried to go to program type but can't because there are none for 120 baseboard.. so I bought a simple one instead)... I have 120 volt and there are 2 wires from the wall... 1 red 1 white... there are 2 wires from the thermostat... 1 black and 1 red... which goes with which please? Red thermo. To red wall or red thermo to white in wall?

Red thermo to white.