A detection and control device for a supply vent of a heating or cooling system includes a housing attachable to the supply vent, a display configured to present a message to a user, at least one sensor configured to measure at least one parameter, and a central processing unit. The central processing unit is programmed or configured to receive an input from the at least one sensor, determine based on the input received from the at least one sensor if one or more of the parameters measured by the at least one sensor is within a predefined safe zone, and generate and communicate an instruction to turn off a component of the heating or cooling system based at least partially on a determination that one or more of the parameters measured by the at least one sensor is outside of the predefined safe zone.