Tom heads to the windy city suburb of Park Ridge, Illinois, where he helps homeowner Richard Westphal replace the broken window pane in an exterior door. Back in the loft, Tom and glass expert Larry Rosenfield show Kevin different kinds of safety glass. Afterwards, Tom, Kevin, Richard and Roger ask, "What Is It?" Then Roger is off to Brookline, Massachusetts to "let the sunshine in" for homeowner Elizabeth Choi by pruning her Pin Oak tree with the help of arborist Matt Foti.