Moving LiFePo4, Rewire or run Long Extensions?

I have a Bigfoot 10.4 with 2 Lifeblue lithiums. Just stuffing a small blanket inside the door takes care of most of my issues. Started to use that blankie for the dog, so now will use facon heating pads, only if I need to charge and the batts are 40 or below. With blanket and cabinet doors open, will have to be quite cold outside air. Been down to teens at night and daytime high of 33, but moved after 1 day!