Bucks County is famous for its stone houses, although there are numerous examples in Hunterdon County NJ as well. Why are there so many? Since major roads from Philadelphia to New York passed through this region, there was a considerable population that settled here in the Colonial days. Of course, all old houses are not necessarily made of stone; you can find many clapboard wooden houses as well. And when it comes to heating, you may be surprised to learn that many people didn’t start converting to “modern” fuels until the mid-20th century. Here’s where we started:  WOOD: It goes without saying that wood was the primary heating fuel for centuries. We all love the huge stone walk-i…