Each of these wires is color-coded, and each terminal most probably has a letter code: Red: The red wire is the wire bringing power to the thermostat, and connects to the terminal marked “R.” ...

Installation requires a C (common) wire, but you ... and the $249.99 Smart Thermostat Premium (4.1 by 4.1 by 1.0 inches). Behind the black glass is a 2.8-inch full-color touch LCD with 320-by ...

On paper, a smart thermostat is an excellent deal ... Consult the photos you took or your tags, putting each wire color into the proper contact and making sure it is fully connected.

Instead, it uses a white rectangular enclosure that measures 4.9 by 3.7 by 0.9 inches (HWD) and has a 3.3-inch (diagonal) color ... plate, wire labels, and an installation guide. The thermostat ...

And if you live in an older home or one without a C-wire, shopping for a smart thermostat can be challenging. Thankfully, there are a handful of great smart thermostats that don’t require a C-wire.