hi jim,yes popups are pretty easy to heat,as long as your sides are pretty wind proof,i hunt out of one every year,and i use only my propane heater that was built in the trailer,and it keeps it pretty toasty,sometimes to toasty.and they are to me alot easier to get into the woods then a full camper,you dont have to worry bout things getting ripped of the top by tree limbs.since they sit lower than the vechicle pulling it.i will never go to a different type of camper for hunting. take care bob