Hi all. I'm about to run out and get some groceries to prep for this storm we have comming in but I'm a little worried about the temp shift. The ladies have handled single digits before no problem but the lows for the last month or so have been around 15-20ish degrees. Now we're looking at a forcast of -7 with upwards of 20 mph winds. Do we need to look at getting some form of heat into the coop or bringing them into the garage? Or will they be fine? We've given them some extra scratch and some BOSS but I want to make sure we cover all the bases. They're in an Eglu cube.