Pop Up Soft Side Campers in the Winter

I have a Northstar 850. I use it every week of the year in NH. Temps at night typically in single digits to teens through the winter. I use it plugged in. I use a small 1500 watt electric heater. Usually it's on medium and keeps it in the low 60's inside. I rarely use the furnace as I don't like the cycling on and off. I do have what they use to call an Arctic Pack which is slide in reflective panels like you put inside your windshield on hot days. These go all around the inside of the canvas. That's it. No insulation covering skylights or windows. I stay toasty.