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 [https://amzn.to/2RNofUq] Small flathead screwdriver [https://amzn.to/36N95Cy]…





