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iMac glass screens experiencing unwanted condensation
Condensation behind iMac 24 glass, Moisture in an Imac
According to the Apple support forum, more than a few users have experienced condensation behind the LCD. For now, there is no mention of any damage resulting from this, but as we all know, combining water and computers is never a good idea (unless you're talking about water-cooled systems).
I have experienced condensation builds up in the lower corners, goes away, and then comes back when the surrounding environment drops in temperature. This issue will re-occur each time the physical conditions are met. I did experience the Moisture in an Imac twice in just last one month.