Computer monitors used for monitoring the operation of cooling and heating systems and signaling upon system exception; telephone transmitters, which transmit warning signals concerning abnormal operation of cooling and heating systems

Computer monitors used for monitoring the operation of cooling and heating systems and signaling upon system exception; telephone transmitters, which transmit warning signals concerning abnormal operation of cooling and heating systems

Computer monitors used for monitoring the operation of cooling and heating systems and signaling upon system exception; telephone transmitters, which transmit warning signals concerning abnormal operation of cooling and heating systems

Telephone transmitters, which transmit warning signals concerning abnormal operation of cooling and heating systems

providing information online and via telephone regarding the operation of heating and cooling systems and possible system misfunction