No, there is no mandatory monthly subscription fee required to use an Ecobee smart thermostat. All core climate control features—including remote mobile app access via iOS or Android, automated scheduling, geofencing, room sensor management, and local multi-zone heating and cooling control—are entirely free. Optional paid subscriptions (such as Ecobee Smart Security) apply exclusively to home monitoring camera services and professional security alerts, not to the thermostat itself. Verification: Check your Ecobee account settings to confirm full access to all thermostat control features without active subscription charges.
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