Work continues indoors and outdoors at the Winchester, Mass., rehab. Indoors, grout is applied around the tiles of the sun porch; plumbing-heating expert Richard Trethewey tries out the new steam shower in the master bath while an oak floor is installed in the master bedroom. Outside, landscaper Roger Cook shows homeowner Kim Whittemore how he'll hide air-conditioning condensers. Meanwhile, host Steve Thomas examines lampshades at a Boston boutique. And on “Ask this Old House”: projects include painting the exterior of a double-hung window and hanging a picture on a hollow wall. In the “Housecall” segment, Cook helps a suburban-Boston couple aerate and fertilize their lawn.