No, there is no mandatory monthly subscription fee required to use an Ecobee Smart Thermostat Premium. All core climate control features—including remote mobile app access, automated scheduling, Eco+ energy optimization, geofencing, multi-room sensor management, and air quality tracking—are entirely free. Optional paid subscription plans (such as Ecobee Smart Security) apply exclusively to optional home monitoring camera hardware and professional security alarm tracking services, not to climate control. Verification: Check your Ecobee account settings to confirm full access to all thermostat control features without active subscription charges.
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