The Carlisle, Mass., farmstand will soon go on the market, so host Kevin O'Connor discusses sales strategy with real-estate agent Laura Balistiero. Meanwhile, work progresses. The highlight: a new fieldstone hearth. But there's also shingling (by high-school apprentices) and roofing to be done. On “Ask This Old House,” projects include stucco repairs to a Los Angeles house, and removing consolidate from a Bedford, Mass., homeowner's basement dehumidifier.