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

A video on YouTube. In DIY & Home Repair, a Krater category.

Summary by Krater

This Old House plumbing and heating expert Richard Trethewey demonstrates how to upgrade a standard two-wire thermostat to a smart, multi-feature Wi-Fi thermostat using an Invita HVAC interface module without running new wires.

From the video

Answers: How can I upgrade to a smart thermostat without changing the wiring?

Smart thermostat installation
Two-wire thermostat upgrade
HVAC interface module
Thermostat wiring compatibility
Furnace wiring connections

What it concludes

You can upgrade to a smart thermostat without adding new wires by using an interface module that reuses existing two-wire connections for power and communication.
The interface module provides power from the basement unit upstairs and supports future additions like air conditioning, ventilation, and humidity control.

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