Thu, 10/26/2023 - 11:39 Android Central If you're going from an older thermostat to a new smart one, you may find that your system is without a C wire. If that's the case, you can install one, pay to install one, or simply grab one of these smart thermostats that don't even need one. Tags Smart Home, Accessories Source Best smart thermostats that don't require a C wire 2023