@conropl People often only consider condensation with cold outside coming into the warm. However, where I live (Florida) the problem is opposite. The AC cools off the lens so that the minute you step outside your camera lens (or camera, or glasses) will fog. My solution to this problem is storing my camera gear where it's warmer than the rest of the house - like on top of the refrigerator or in the computer cabinet. That way when I walk outside the camera gear is as warm or warmer than the ambient and there's no condensation.