Kevin meets HFOT community outreach coordinator Chris Mitchell, who explains why community involvement is important. More than 150 local volunteers are laying down the sod, mulching the beds and planting. Closet builder Brian McSharry has been working with the DeWitts on a special design for the master closet, and Norm and Kevin work with Matt to design and build a table for the new dining room. At the end of a long journey, the DeWitts move into their new home. On ASK THIS OLD HOUSE, Richard travels to Pittsburgh to install a thermostat that interfaces with a smartphone to save energy and money. Ross Trethewey walks Kevin through the installation of a photovoltaic solar array on the barn.