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

Can you tell me how well solar hot-water heaters work?

— Betsy Humes, Brooklyn, NY

Answered by Paul Rosen on July 17, 2008

I am interested in solar PV. What do you recommend for an old house?

— Exton Quinn, Santa Monica, CA

Answered by Paul Rosen on July 17, 2008

Can solar work on a northeast-facing house?

— Valerie, Zionsville, Pa.

Answered by Mick Dalrymple on May 22, 2008