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

What are my options for a third floor mini-split install?

— Robert Cleveland, OH

Answered by David Willson on February 13, 2013

I have a 1909 home in North Dakota with a pitched roof that needs insulating.

— Matthew Picklo Grand Forks, ND

Answered by Sean Lintow Sr on February 13, 2013