No, the Honeywell Lyric T5 Wi-Fi Thermostat requires a C wire or Common wire be connected to the C terminal in the thermostat and at the ...In order to power most of our Honeywell Wi-Fi smart thermostats, your system must contain a C-wire. There is an exception, specifically if you have the Lyric ...Optional Power Adapter Included - a low voltage alternative if your home does not have a "C" wire for installation. ... honeywell lyric thermostat apple home kit enabled Honeywell lyric t5 amazon to echo compatible Honeywell lyric t5 google ...The C-Wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. It's a wire that (if you have one) runs all the way from your furnace ... Trying to install a smart thermostat only to find that your system doesn't have a smart wire?