Charlestown Homeowner Dan Beliveau, John Ambrosino President of Total Temperature Control, Inc. and This Old House's Richard Trethewey, heat-and-cooling enthusiasts all scope out a 55,000-BTU gas furnace at Total Temperature Control's showroom, in Wakefield, Massachusetts. This slim, energy-efficient unit, similar to the two that have gone into the This Old House, Charlestown project, uses ordinary PVC pipe to supply the burner with intake air and to exhaust its relatively cool flue gases.

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