A copper roof is installed on the Concord, Mass., barn, while inside there's a new cast-iron whirlpool tub, a European-style towel warmer (which doubles as a bathroom heat source) and a split-type air conditioner. Meanwhile, host Kevin O'Connor visits a cottage in Martha's Vineyard, Mass., that was redone for an active senior couple. On “Ask This Old House,” projects include repairing a water-heater chimney flue and installing an “anti-sweat” valve to prevent condensation on a toilet tank.