$50 QUESTION -- Category: Power House

Once walls have been insulated, unimproved doors and windows can still account for how much heat loss in winter?

  1. Every bit of it -- 100 percent. After all, the walls are insulated. Duh!

  2. Up to 50 percent.

  3. None. If you keep leaky old doors and windows closed, they don't cause any problems.


     Click on the answer you think is correct!