A method of and system for automatically adjusting airflow and sensors for use therewith are disclosed. A sensor assembly includes a first face on an opposite side of the sensor assembly relative to a second face. The assembly includes an electrical plug on the first face and an electrical outlet on the second face. The electrical outlet is of a same type that is complimentary to the electrical plug on the first face. The assembly includes a sensor for sensing a value of an environmental variable in a space and a sensor communication system for transmitting and receiving information. A sensor system includes a plurality of sensor assemblies disposed in a building. Each sensor assembly includes a sensor for sensing a value of an environmental variable of the space within which the sensor is placed. The system determines gradient values for the sensed environmental variable.