How can I lower my room temperature?
How about getting a Portable Air Conditioner - these can be moved room to room as long as you have a window you can feed the exhaust out. The link I provide in the example below shows two types of A/C units make sure you get the Portable Unit and NOT a window unit - they are different animals altogether. 

Or you could buy a fan and place in front of that window.



Example of  Portable Air Conditioner (more examples on Amazon):