So I'm having this problem

My pc at work keeps overheating. It started yesterday when our office was EXTREMELY warm (I am talking 79 degrees!). It has cooled down, but for some reason it overheated again today. GRRR!!!! I know it is due to the additional video card I have installed to run my dual flat panels both DVI, but I don't want to remove that. I guess I'll be running it topless for a while!