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How to Upgrade to a Smart Thermostat without Changing the Wiring | Ask This Old House
Ask This Old House plumbing and heating expert Richard Trethewey replaces an old thermostat with a smart thermostat without replacing the original two wires in the wall. SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Time: 2-3 hours Cost: $300 Skill Level: Difficult Tools List for Upgrading a Smart Thermostat: Drill driver ...
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