The SmartCocoon device can be installed in reverse, allowing it to push air from the room into the return vent instead of boosting air from the supply duct into the room. This configuration works well when your HVAC system is controlled by a Nest or ecobee thermostat, as SmartCocoon receives operating signals directly from the thermostat and will continue to turn on and off automatically in sync with the HVAC system.
However, if your home uses a thermostat other than Nest or ecobee, synchronization can be more challenging. Because the device is not exposed to the airflow from the supply vent in this installation, it cannot use its internal sensors to detect when the HVAC system is running. In this case, automatic synchronization is not available, and the device will need to be turned on and off manually as needed.