Ecobee Smart Thermostat Premium vs Honeywell Home T9 Smart Thermostat

Ecobee Smart Thermostat Premium, on price, sensing (humidity, CO2, TVOC, occupancy, proximity), air quality alerts, six platform integrations, dual-band Wi-Fi and a 3 year warranty. Honeywell Home T9 Smart Thermostat wins on its system health monitor and its long-range Smart Room Sensors.

Both include one. Honeywell Home T9 Smart Thermostat uses Smart Room Sensors with up to 200 ft range that detect occupancy and read humidity. Ecobee Smart Thermostat Premium includes a SmartSensor and selects sensors by presence, and its main unit also detects occupancy and proximity itself.

Only Ecobee Smart Thermostat Premium, which measures CO2 and TVOC, alerts when air quality is poor and reminds you to change filters. Honeywell Home T9 Smart Thermostat measures temperature and humidity and provides filter and maintenance reminders, but no air quality readings.

Yes, both have a built-in speaker. Ecobee Smart Thermostat Premium lets you choose Siri or Alexa Built-in, while Honeywell Home T9 Smart Thermostat provides voice control through its own speaker alongside Alexa, Google Assistant, Apple HomeKit and SmartThings.

Honeywell Home T9 Smart Thermostat includes a C wire power adapter and often reuses the existing wall plate when replacing an older Honeywell. Ecobee Smart Thermostat Premium includes a trim plate and a power adapter, but owners report installation can be trickier in older homes.

Households that need sensors far from the thermostat, up to 200 ft away, with occupancy-driven heating and HVAC maintenance reminders. For a colour screen, CO2 and TVOC monitoring, dual-band Wi-Fi and a longer warranty at a lower price, Ecobee Smart Thermostat Premium is the better buy.