Tado makes smart thermostats that you control via your phone. This way, you can control the temperature of your Tado smart thermostat even when you're not at home. You can also program the thermostat, so it's never on when you are not at home. That saves energy costs. Tado's smart thermostats also have extra options when you subscribe. For example, the Tado thermostat recognizes an open window. You can also view the statistics of your energy consumption.