In order for a smart thermostat to earn the Energy Star, it must show the yearly savings based on its home installations all over the US. This secures that the manufacturer’s claim is taken from data based on real world and interaction with the product among users. This is something that is not present in the previous labors to identify the efficiency of the thermostats. Aside from this, thermostats with Energy Star approval are certified by the certification bodies recognized by the EPA.