Hmm, what is the usual heat temperature where you live? Because that can be a factor you know.
Personally, I live in the UK, and with our weather, I've never had a problem like that, has anyone else had overheat problems, or the mchine is so cold it can't operate?
If it overheats, then open it up and add another fan to the side (I beleive one of those old overclocking fdans for the frst pentiums should do the trick, VERY Powerfull and large) or if it's too cold, well, try and heat it up.