It's too cold / hot in the room.
The thermostat is set to heat to ~68 degrees, and cool to ~72 degrees, and will automatically switch between heating and cooling as needed. This is preset. With this in mind, there are some sections of the room that may feel warmer or cooler than the rest of the room. (Generally seats closer to the window will be warmer when it is warm outside, and may be cooler when it is cool outside.) Keep this in mind when selecting seating at the start of the semester.