By Elizabeth Razzi
Special to the Washington Post Friday, October 8, 2010; 9:15 PM
Icicles hanging from the eaves were not the result Dave Parsons had in mind when he installed a geothermal heating system at his Oakton home during the summer of 2009. But that's what he got during last winter's brutal cold spells, when the new system leaked hot air into his under-insulated attic. And monthly electricity bills as high as $560, the result of his geothermal's backup electric resistance heater kicking on too frequently, weren't welcome, either.
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