Sometimes, in the midst of summer or winter, a room can be too cold or too hot relative to the rest of the house. You can prevent the heat or air conditioning from making the temperature too extreme in one area of the house or office by adjusting the ceiling vent. Closing the vent will block all air from coming through and opening it will allow the air to pass through again; the degree to which the vent is open or shut can be adjusted midway to allow some heat or air conditioning to flow through. This lets you control the temperature in one area without changing the thermostat temperature.
Place a stool or ladder under the vent you want to adjust. Put the ladder or stool are in a locked position if possible, to prevent it from collapsing.
Step up on the ladder or stool until you can comfortably reach the vent.