Whether the thermostat needs a C-wire: The C or common wire (usually clearly labeled) is a low-voltage wire that can provide power to a thermostat. Some thermostats require a C-wire to work.

If the wires aren't labeled, use the stickers Ecobee provides to ensure each wire is clearly and accurately labeled. Now you can remove the rest of the thermostat and set it aside.

Considering upgrading your home with a smart Nest Thermostat? Here's everything you need to know about choosing the right one and exactly how to install it.

Fortunately, Ecobee includes a Power Extender Kit (PEK) as a workaround so you don't have to install another wire. I didn't have to use the PEK, since I have a C-wire.

Next, match letter to letter as you connect the wires to the replacement unit. Install batteries if appropriate, finally snap on the thermostat cover to finish the job.

Physical installation is also just one part of the process. A lot of the “smart” in your smart thermostat comes from hooking it up with your phone.

While there’s no hardware presence at I/O 2021, Made by Google today did release the Nest Power Connector as a “simple and affordable alternative to a C wire” for Thermostat setups that ...