Any links to said heater?
i have a remote starter on mine. also have the 3 cyllinder idle and auto high idle when cold. i have a 1200W electric heater in the cab along with the factory radiator heat. so on RS if below 30F the electric heater powers at 600W and high idle kicks on. if under 15F the 3 cyllinder kicks on and the electric heater runs at full 1200W. if engine temp reaches 100F and RS is still active the blower motor will power on and then shuts off for manual control upon remote start shut down.
i also have my wiper motor wired to aux on the remote start so it will activate from my remote or phone if i want to clear snow with out having to go outside.
the defrost auto triggers with remote start under 35F as well.