Keeping peinter warm enough to print in very low temperatures

So its very cold currently where I live and my printer is in my garage. Now I do have a fermentation belt on my printer and I fear its not enough, i put a cardbaord box over the printer as well to try and keep it the cold temperatures out. What else can I do so get it warm enough to print. I know ive been asking this alot. Now i do have some options. I could glue some insulation inside the cardbaord box now I dont know if it will make a huge impact, maybe putting a towl over the cardboard box could help