No C Wire Options
Compare no-C-wire smart thermostats by power method: included adapters and extenders, battery power, and the line-voltage systems to rule out.
Smart WiFi Thermostat Temperature Controller WiFi Smart Control for remote adjustment
AirPro Collection Smart Fan WiFi Module Gray Compatible with Alexa/Google Home
Honeywell Home S200 Up to 3H/2C heat pump and 2H/2C conventional
5-Inch Full-Color Touch Screen Smart Thermostat Alexa-enabled connected thermostat
nVent Nuheat Signature WiFi-enabled 7-day programmable scheduling
Thermostatic Radiator Valve with LCD Display Zigbee 3.0 technology for smart home integration