Amazon is currently offering the 2nd generation ecobee3 bundle with one sensor for just $199. This is a $50 savings from the normal $249 price point, and makes it an even better value. Installing a Wi-Fi thermostat in your house can help save up to 23% on your energy bill, which is a substantial savings over time.
The ecobee3 is Homekit-enabled, so you'll be able to use voice controls through Siri to change the temperature and more. It also works with Amazon's Alexa for voice controls. If you are looking to make your house smarter, or just want a new thermostat that offers some additional functionality, you'll want to check this deal out.