Sensi Lite Smart Thermostat, Programmable, WiFi, Easy DIY, Works With Alexa, ENERGY STAR Certified, ST25, Most Systems C-Wire Not Required, C-Wire needed with Heat/Cool Only & Heat Pump System – Black

EASY DIY INSTALLATION: Do it yourself fast with a built-in level and simple step-by-step instructions. Works with the HVAC equipment found in most homes COMMON WIRE REQUIREMENTS: Common wire(C-Wire) required for heat pump and heat/cool only systems.