How do I cool down a room?
user
This is really dependent on your temperature goals, and how hot or cold the room is currently.
assistant
I want it to be slightly cooler.
user
So let’s look at how the heat gets in your room and how it gets out.  The room is going to get hot if you have poor insulation, an inefficient heating system, or if you have a window open.  The colder you make your room, the less heat the walls will keep in.  If you want to cool your room without lowering the overall temperature, you could use something like a small fan to force air around your room, or you could use something like a dehumidifier to reduce the amount of heat the walls retain.  You can also use a thermostat to raise or lower the temperature.  
If you want to bring in cooler air, you could also open a window, or use a fan, like I mentioned above, to create a cool breeze.  These are some options!
assistant
How do I cool down a room?
user
This is really dependent on your temperature goals, and how hot or cold the room is currently.
assistant
I want it to be slightly cooler.
user
How about 30°F or 18°C?  What’s an approximation of your current room temperature?
assistant
How do I cool down a room?