As the MC at an event you are in charge of the well being of the entire event and in particular the comfort of your audience.
Keep a good eye out on the temperature of the conference room and if in any doubt ,turn it down.
Hot stuffy rooms send audiences to sleep faster than sleeping pills, especially later in the day. Try and start with the temperature quite low, as the heat will rise as the delegates fill the room.
And yes, this is the role of the MC.