Yeah, winter is an issue here for sure. I grow in my garage and it will easily get down to 10-14F in there. I had to insulate my whole tent to get it through winter at about 74F steady. I’m considering running a MH light for the heat during veg and HPS for flower. I might as well put money into growing and heating than just full on heating. Right now I use Autocobs and they don’t put out a lot of heat.