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Are geothermal heating/cooling systems better in reducing energy costs than solar power?

— Kimberly

Answered by Mick Dalrymple on June 26, 2008

We're buying a house with 25-year-old solar panels. Should we have the system updated?

— Michael and Amy Bergman, Alexandria, VA

Answered by Ricky Cappe on July 3, 2007

I want to convert my home to solar energy. Should I install panels on the roof or build a trellis?

— Mark Conrad, Venice, CA

Answered by Cynthia Phakos on June 19, 2007

 
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