Ask This Old House

Programmable Thermostat; What Is It? Plaster and Lath Wall (2x20)

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Plumbing and heating expert Richard Trethewey shows a homeowner how to install a programmable thermostat to reduce his heating bills. Back in the loft, Richard, general contractor Tom Silva, landscape contractor Roger Cook, and host Kevin O'Connor try to guess "What is it?" Then Tom helps a homeowner repair a cracked plaster and lath wall in her daughter's bedroom.