Winter Problems.

So, I've got everything I need for a cabinet setup and I realized last night that it gets cold in the winter where I would have my plants. My box is like 3x3x2 and I'm fucking struggling to think of some ideas as how to keep my box warm during the dark period. I need something without lights and something thatll keep it like 60-65. It gets cold enough to see your breath where my box is. I cant think of a thing. Any help would really help.

walmart sells small room heaters that have a simple thermostat for like $15 dollars it has a small red light that could be easily blacked out with tape and that would easily keep the temps in your box.

Beautiful. thank you.