Tom helps homeowner Tarah Hirschey of Wellesley, Massachusetts make her old windows more efficient by installing new storm windows. Then, Roger offers tips for getting your shrubs ready for winter. Afterwards, Tom, Roger, Richard and Kevin ask, "What Is It?" in the Ask This Old House loft. Finally, Roger heads to New York City where he meets up with home inspector Stephen Gladstone and homeowners Roy and Sophia Pachecano for some potentially life-saving lessons on carbon monoxide detectors.