It hasn't got something to do with the cool air, but with the power surge caused by the machines:
Ben Carmitchel, president of ESS Data Recovery said that his company is run off its feet in summer months and it is not because air conditioners are allowing computers to overheat.
He told Associated Content that he sees a 20 per cent increase in failed hard drives hitting our lab in the summer because of the power surges caused by air conditioners.
Air conditioners increase the electricity usage in a house by 50 per cent and this additional strain can cause dangerous power surges and outages that damage computers.