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Since you may not be comfortable installing the wire yourself or paying for an electrician, these smart thermostats without a C wire will still reduce your energy bills.
Best of all, the Google Nest Thermostat is incredibly easy to install and is one of the most versatile Wi-Fi thermostats with no C wire. The Google Nest Thermostat E uses a rechargeable battery to bypass the requirement of a C wire. It's compatible with most voice assistants and easy to use.
Thankfully, there are a handful of great smart thermostats that don’t require a C-wire. Here’s a closer look at four smart thermostats you should consider.
If you’re looking to replace your current thermostat with a smarter one that operates completely without a c-wire or blue wire, then your best choice is the Google Nest Thermostat E or Nest Third Generation. The best overall smart thermostat is the Ecobee Smart Thermostat, but it does need a c-wire adapter.
Here are our top three recommendations for thermostats without c wire or one that includes an adapter. Recommended Smart Thermostats with C Wire 1) EcoBee SmartThermostat with Voice Control
Ecobee (5th Gen): Best Overall Smart Thermostat Without C Wire. The Ecobee Smart Thermostat (5th Gen) can be battery-powered, or you can use the electrical outlet with the power adapter in the box. It also comes with an Alexa built-in, which is extremely efficient.
There are three ways you can use a thermostat without a c-wire, and I have recommendations for each of these options below. Using an internal rechargeable battery, or plain old AA or AAA batteries, a thermostat can maintain the power it needs to run its smarts without any external power source.
Other devices, including Nest thermostats, can be installed without a C wire but steal power from the furnace control circuits to provide enough power to keep the internal battery charged.
If this is you, consider the Sensi Lite Smart Thermostat (available at Amazon) , which is simple and affordable enough to be a good pick for older homes that don’t have (or want to...
DIY your smart home with the Sensi smart thermostat. Compatible with most residential HVAC systems and so easy to install—no common wire (c-wire) required in most applications. You can trust Sensi as we do not sell your personal information to third parties.