SMART HOME DEVICE FEATURE SET SELECTION BASED ON POWER SOURCE AVAILABILITY

Feature sets of smart home devices may be activated based on whether they can be supported by a selected power sourcing method. For example, thermostats may use a technique known as “power stealing” in order to steal power from the HVAC system. Different algorithms and techniques may be used for efficiently stealing power from the HVAC system, each of which may provide different levels of power to the thermostat at different times. The smart home device may test an external system to determine which power stealing methods are compatible, then select predetermined feature sets that are compatible with the available power stealing methods.