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.

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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]

Shopping List:
Smart thermostat [https://amzn.to/2tcUF0S]
Thermostat wire [https://amzn.to/31kxP4g]

Steps:
1. Start by turning off the service switch at the furnace.
2. Remove the old thermostat.
a. Pull off the front cover.
b. Unscrew the screws inside.
c. Disconnect the wires.
d. Pull off the back cover.
3. Mount the hub in a convenient location near the furnace using a drill and a few screws.
4. Disconnect the wiring from the thermostat to the furnace and run that wiring to the hub. There’s an obvious place on the hub to screw the wires in properly.
5. Run the thermostat wire from the furnace to the hub. The red wire goes to R, the white wire goes to W, and the blue wire (common wire) goes to C.
6. Mount the new thermostat back cover at the location of the old one. This might require drilling for new screws.
7. Using the old two wires, wire the new thermostat and connect it to the back cover.
8. Turn the service switch back on at the furnace.
9. Download the smart app and program it to the thermostat following the manufacturer’s instructions.

Resources:
Richard installed the InvitaTM Wifi Thermostat 564, which is manufactured by Tekmar Controls (http://www.tekmarcontrols.com/).

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we’re ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O’Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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Keywords:
This Old House, Ask This Old House, DIY, Home Improvement, DIY Ideas, Renovation, Renovation Ideas, How To Fix, How To Install, How To Build, Richard Trethewey, heating, plumbing, thermostat, smart technology

Watch the full episode:
https://www.thisoldhouse.com/season-18-ask-toh-episodes

How to Upgrade to a Smart Thermostat without Changing the Wiring | Ask This Old House
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