We never did go back into the depth of winter (except for camping, oddly enough!) In November, we stayed very toasty with the heater in our standard car camping bags (perhaps 40F bags). When we camped in February, the bathrooms stayed heated and had running water, but the showers were shut off for the winter. In addition to the theater, there’s a small microwave. You may want to bring a camp stove for cooking or pre-cook dishes to heat up there. Hope this helps!