Maybe, maybe not. There are A/Cs with heat strips, A/Cs with heat pumps, and A/Cs that have no heating mode.
Mine has a heat pump, uses a single thermostat to control A/C, heat pump, and furnace; same as my house.
Thermostat at the house lets me set "Auto" and the system uses the A/C in cooling or heating mode, switches to the furnace when the heat pump can't keep up. RV is not so simple. RV has "Cool" "Electric Heat," and "Gas Heat." On "Electric Heat" it runs the heat pump until the heat pump can no longer stabilize the set temperature, then it turns on the furnace. Heat pump blows out the ceiling, furnace through vents near the floor.
If you don't have a heat pump, you might have a very low output heat strip running on the "Electric Heat" position. That will blow through the A/C outlets. Since I don't have this, I don't know if it will switch to the furnace when the heat strip can't keep up, or if you might have to manually switch it.