we are in NJ, have camped in similar weather, no worries. Just watch that warm air is getting to your pipes, if you have a pipe that runs along an outside wall keep the cabinet open for the night. our pipe for water to the shower runs through the vanity on an outside wall, so we keep the vanity door open. we learned that lesson the hard way, went to take a shower after a cold night with snow and didn't have water, fortunately the pipe didn't crack and a couple hours of the space heater blowing into the cabinet it defrosted.