Ecobee's Smart Security system now integrates with Apple's Home app, allowing users to control home monitoring modes like Stay, Away, and Disarm via the app or Siri. This integration enables the creation of HomeKit automations and provides push notifications for mode changes. Ecobee's Smart Thermostat Premium can function as a security hub, connecting with cameras and sensors for various alerts, including motion, entry, and smoke detection. The Ecobee Smart Security plan is available for a monthly fee, with an option for professional monitoring.