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

— Betsy Humes, Brooklyn, NY

Answered by Paul Rosen on July 17, 2008

Is limestone tile a sustainable choice for a pool and patio surface?

— Lynne Latham, Los Angeles, CA

Answered by Cassandra Adams on November 20, 2007

Can I switch to solar-heated water in my radiant heat system?

— Lynn Freeman, Sandy, OR

Answered by Connie McCullah on August 21, 2007