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Suzanne Kreiter/Globe Staff
Solar panels are visible on the roof of Brian Foulds’ Concord home, which will be part of an eco-friendly house tour.
Foulds stands outside his family’s Concord home.
Window sills are extra wide because of thick, insulated exterior walls.
The fireplace is for decoration only.
Foulds monitors home power usage from his computer.
The front steps are recycled granite.
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