Are solar panels a viable replacement for propane heating?

— par Mountain View, CA

Answered by Lee Hall on August 29, 2010

Is it possible to combine solar thermal collectors with a hot water on-demand system?

— Francoise LaMonica, Newton, MA

Answered by Ian MacLeod on February 5, 2009

I want to help get my mom's house "off the grid." Where do I start?

— Jackie Mellen, Chipley, FL

Answered by Florian Speier on October 3, 2008