@BReeder!
You have winter hardy breeds & no big rooster combs. Good ventilation, draft free, dry, & a few chickens to cuddle with and they'll be good. The seramas are not made for Chicago winters. Very small, not much body mass, light thin feathers w/o excess down, tall thin combs. Seramas are made for hot humid climates, so that's why I'm nervous.
I checked on the main coop & all were well. I did play a little musical roosts to put my Sebright between 2 big orps and forced the Leghorn to sleep inside the insulated coop instead of the run. I only heat the chicken waterer - not the coop.
You'll want to check on the chickens when you get home, but you probably won't need to heat. Just make sure they all have cuddle buddies & that you don't see any crystals condensing inside the coop or feel any drafts blowing on them.