Equipped with the essential features to start saving you up to 23% annually on heating and cooling. Connect to SmartSensor (sold separately) for better comfort in the rooms that matter most. Ecobee3 lite heats and cools more efficiently over time by factoring in weather patterns and HVAC system performance. Plus, monthly energy reports show how much you saved and how to save even more. Manage your comfort from anywhere with the Ecobee application on your iOS or Android mobile device.