there are countless numbers of control systems and sensors that would fit this description. It sounds like it would be an easy retrofit, many DDC sensors come with no local control adjustment or control can be given and taken away with a keystroke and are tamper resistant. Call a local DDC...
I would go beyond the humidity sensors and say that the most comfortable auditoriums have C02 sensors and can modulate the OSA. it is also a huge energy savings only introducing the OSA that is needed. An automation system is definitely the way to go and the savings that could be achieved would...