[For Contractors] What thermostat temperature differential will cause the HVAC system to turn on with Ecovent?

This depends on the home. Ecovent's main goal is to provide the users with maximum comfort but do so in a way that will be safe for their HVAC system. The smart hub looks at the climate in every room to decide how to control the thermostat. Ecovent's proprietary control algorithm also prevents "short cycling" of the HVAC system.