Sensi Lite Smart Thermostat, WiFi, Alexa, DIY, Energy Star Certified, ST25

COMMON WIRE REQUIREMENTS: Designed to work without a C-wire in most homes, but for some systems, including heating only, cooling only, and heat pump systems, you’ll need a C-wire or other compatible power accessory
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
SAVE ABOUT 23% ON HVAC ENERGY: ENERGY STAR-certified and packed with features that help you save money, including flexible scheduling, geofencing, remote access and usage reports