With cool winter air all around your home, why not funnel it into your PC to keep it cool? Simply hook a dryer duct through a window opening and attach a fan to feed in outside air. You will also need a Scotch-Brite filter to clean the incoming air (and prevent condensation).
It’s a simple build you could tackle within an afternoon. Check out a few more pictures of the simple project and build one for yourself if you live in cooler climates.