Our top-choice smart thermostats that don’t require a C wire in 2021 are…
Many of the best smart thermostats require a C wire (“common” wire) for power due to their LED displays and Wi-Fi-powered advanced functions, leading homeowners with older heating systems to look for smart thermostats without a C wire requirement. If you don’t already have a C wire in your system, these smart thermostats use separate power sources or adapters that let you monitor your home climate without having to hire a professional to rewire your home.
Simple and straightforward
Nest Thermostat E smart thermostat
Staff Pick
Our top pick for the best smart thermostat without a C wire goes to the Nest Thermostat E. Its display simply shows the temperature setting, while the app lets you prioritize certain rooms’ cooling, change settings when you’re away, and lets you know if it senses a problem. Most importantly, the Thermostat E features a built-in rechargeable lithium-ion battery that bypasses the C Wire requirement. So if you can still find it in stock, this minimalist ther…