Closed. I often wake up extremely hot (my computer is on 24/7 - in fact, it's been on 3 days, 5 hours, 53 mins and 49 secs at the time of this writing) and it generates ALOT of heat, but if I open my window...well, grasshoppers jump in, flies get in my nostrils, spiders that are so big I'm not even sure if they're legal, and alsorts of other freaky things with legs get in. So i open my door instead, which balances the temperature out in about 5 minutes to a nice cool temperature...but then I get too cold. Still, I like this computer. It provides all this computer stuff and heat to boot. Hooray!