RV A/C Wall T'stat Wiring

Do RV manufacturers normally run the heat wire to the wall thermostat even if the A/C unit does not have heat?

I'm asking because I may order a new rv which has a Coleman A/C unit without the electric heating element and it is controlled by a wall t'stat. The t'stat has the heat setting on it.

I want to add the electric heat element and I'm wondering if I will have to add another control wire from the unit to the t'stat.

Thanks for any help,
BradW