What an infrared camera sees

Joshua Rosen (right, helping an energy auditor get a thermal reading on his back door) learned of numerous insulation issues in his Westford farmhouse. The following photos are examples of what an infrared camera sees when pointed at poorly insulated areas.
Joshua Rosen (right, helping an energy auditor get a thermal reading on his back door) learned of numerous insulation issues in his Westford farmhouse.

The following photos are examples of what an infrared camera sees when pointed at poorly insulated areas.
(Yoon S. Byun / Globe Staff Photo)

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