That's a nice idea on the Arduino - that way you could also possibly rig up a thermometer and a relay that to a dimmer switch to maintain a constant temperature as a colleague of mine suggested.
Personally - I went a bit more rough and ready/hammer and nails/plyboard and sweat in my design...
Now that you mention a bigger fan - something just occurred to me. Somebody's laptop at work was getting hot, and we bought him a fan to put underneath his machine (budget considerations...). That fan would work well in this scenario...
A few people on this thread have mentioned malting. Considering the lack of any outlets for malted barley here in Guatemala, and considering that the vast majority of any grain bill in the majority of ales is malted barley, I decided to have a go at malting my own.
Pacayaforhops made an...