Ecobee Smart Thermostat Premium vs Sensi Smart thermostat

The Ecobee Smart Thermostat Premium is the better overall thermostat, with a higher owner rating, a color touchscreen, air-quality sensing, a fuller alert suite, dual-band Wi-Fi and a built-in speaker. The Sensi Smart thermostat is the more affordable, simpler alternative.

Feature depth. The Ecobee Smart Thermostat Premium adds TVOC/CO2 sensing, air-quality/fire/intrusion alerts, a speaker and a bundled sensor, while the Sensi Smart thermostat focuses on a large 5-inch monochrome display with humidity sensing and voice control at a lower price.

The Sensi Smart thermostat has the larger 5-inch screen, but it is monochrome and non-touch. The Ecobee Smart Thermostat Premium's 4-inch display is smaller yet is a full color touchscreen you control directly.

The Ecobee Smart Thermostat Premium. It adds TVOC and CO2 sensing with air-quality alerts, which the Sensi Smart thermostat does not offer, though the Sensi does include humidity sensing.

Buyers who want the most complete unit: air-quality and CO2 sensing, a full alert suite, built-in voice and speaker, an included sensor and trim plate, and dual-band Wi-Fi.

Buyers who want the more affordable option with a big readable display, humidity sensing, Apple Home support and voice control, and who do not need air-quality monitoring or the full alert suite.