My impression is that these power supplies are usually in separate rooms or even buildings, so you can have different temperatures there. > *It could be the ca

My impression is that these power supplies are usually in separate rooms or even buildings, so you can have different temperatures there. > *It could be the case that the equipment needed to cool to 25C is not that different or more expensive that the equipment needed to maintain a temperature of 40C. * From what I've heard, cost difference is quite large.