Plot: Halfway through the renovation in Auburndale, master carpenter Norm Abram lends general contractor Tom Silva a hand patching in some sidewall shingles on the front of the house. Down in the basement, host Kevin O'Connor finds plumbing and heating expert Richard Trethewey installing the ductwork for the new hydronic heating and cooling system, chosen for its flexibility in duct sizes, which are installed in the ceiling over the family room to feed the sunroom above