My house is always cold.

— Daisy Philadelphia, PA

Answered by Scott Grieves, CPM, CEA on March 6, 2013

How do I build (detail) an insulated shallow foundation with a (wet) radiant slab?

— Charles schwab AIA, CAPS,, CGP Bettendorf, IA

Answered by Sean Lintow Sr on March 6, 2013

What is the most efficient source of additional heating to supplement my home's gas furnace?

— chris bacogiannis Walnut Creek, CA

Answered by Lucas Johnson on February 26, 2013