Cold Air Return to Nowhere
As we worked our way across our unfinished basement, we discovered a few cold air returns left open from the floor above that didn't go into an actual return duct. Mark Loscutoff, our certified home energy rater, worked along with us to determined these had just been left open after a previous owner had done a remodel of the rooms above.
To solve this energy leak, we filled in the open spaces using Thermopan, which is a foil wrapped cardboard, the adhesive Great Stuff, and staples.
The basement area will have much more work, like special wall insulation for unfinished spaces, but we must wait for warmer temperatures.