I put 2 servers in my closet which run at about 90F. The closet has a window, but simply opening the window doesn't drop the temperature very much even when it is 60F outside. If I open the closet door also, then the temperature matches the other rooms no problem: ~75F, but I'm worried I'm losing all the cool air inside my house and wasting A/C because of this.
I'd like to keep the closet door closed and rig something up to pump hot air out of the room just through the window. I'd like to do it as cheaply as possible and I don't care about how it looks.
I could install a window A/C unit, but that would cost $150. I was hoping I could buy a box fan for $10 and some ducting for another $10 to solve this problem. If I install the fan and the intake duct right next to each other, is that a problem? Do I need to seal the fan or intake duct to the window or is that just an optimization?
I'd really appreciate any advice! Thank you!