One hundred years ago, on a snowy, bone-chilling Chicago day like today, the Glessner family would have been huddled by the fireplace in their parlor, since the house’s original heating set-up did not allow winter temperatures to get much higher than 60°F. Now, in 2016, the parlor is located in the first zone of the Glessner House to be heated geothermally, along with the dining room, kitchen, and other first floor rooms west of the parlor. Around the turn of the new year the