Where is your daycare space? Mine is in my basement. The main daycare area is down there, but we use the kitchen and dining room on my main floor. It amounts to about half of the house.
What is your thermostat set to? Mine is set to 22C, which is ok for my family. Since we are in the basement during daycare hours, I get a cold even with a sweater on, so i turn on my electric fireplace and it bumps up the temperature a few degrees. I will turn it off once i don't feel cold. The kids seem to be fine, but i get cold easily, this winter has been brutal for me.