Abstract: Systems and methods for suppressing the spread of fire, fire-related toxins, and other biological and chemical hazards are disclosed. One described system includes a thermostat incorporating an HVAC interface in communication with a residential HVAC system, a receiver operable to receive a signal indicating the presence of a contaminant from an environmental condition detector, and a processor in communication with the receiver and the residential HVAC system and operable to receive the signal from the receiver, and in response, send a signal to the HVAC interface to cause the residential HVAC system to be shut down.

Abstract: Systems and methods for suppressing the spread of fire, fire-related toxins, and other biological and chemical hazards are disclosed. In embodiments of the present invention a controller shuts off the flow of electrical current to the fan of a residential heating, ventilation, and air conditioning (HVAC) system in response to an electrical signal emitted by a detector, such as a smoke, heat, or biochemical detector. Embodiments of the present invention may include a variety of additional features as well, including a notification device and an electrical panel shut off.