You can add-on up to 2 heaters/ tent (more may be available depending on inventory) when electricity is available. If electricity is not available and you would still like heat, you can add on our propane heater instead. These heaters help to keep the interior of the tent nice and toasty, 1 heater will keep the entire tent warm in colder temperatures, 2 heaters will really do the job to keep the tent warm when camping in colder months. We highly suggest when electricity is available to add one of these heaters on to your stay. It makes sleeping so much more comfortable.