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.