The Turn Room Layers Off command turns the room outline and room label layers off. These layers are typically on a non-plotting layer that will not appear on your printed drawings. It is often helpful during the design to turn these layers on and off to see what your final drawing will look like.
To turn the room outline and room label layers off, go to
Ribbon: DM HVAC->Rooms and Walls-> 
Turn Room Layers Off
Pulldown Menu: DM HVAC->Layer Management->Turn Room Layers Off
The room outline and room label layers will be turned off and will not be visible on the drawing.