A house can sit on the market for weeks, even months, and still be a good house. The problem is often not the property itself. It is the way buyers experience it. That is the central lesson behind HGTV’s Unsellable Houses. The show follows twin sisters Lyndsay Lamb and Leslie Davis as they help homeowners refresh homes that have not sold. Their work is not only about pretty furniture or trendy paint colors. It is about helping buyers see a clear, inviting future in a space. T