[AdamJoshua]

Not sure why you would want to raise the temperature, man of the old cigar shots in countries like England store their cigars in damp cold basements, the same as they have for over 100 years and they are amazing cigars. I think you'd be just fine where you're at, I suppose if you thought the water was going to freeze inside the humidor that would be one thing, but doesn't seem that's the case. FWIW many people will freeze cigars when they get them to kill any beetle eggs, then store them away.