You don't need to keep the humidity that high. 50-60% is plenty.
The following is taken from the Crested Gecko FAQ Section
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How much humidity does my Crested Gecko need?
Yes, New Caledonia has high relative humidity, but this does not necessarily mean that the Crested Gecko needs it to survive. I'm from Kansas City and although it gets unbearably humid in the summer here, I could definitely live without it.
A popular misunderstanding about humidity and reptiles is that the humidity needs to never drop below a set percentage. This is not true. You actually want the cage to dry out and humidity to bottom out at whatever it is in your reptile room, creating a humidity cycle.
If the humidity stays too high for too long, bacteria and fungus will start to grow, creating an unhealthy environment. This is why it's important to have plenty of ventilation and to let the cage dry out every day. I typically spray cages at night and let them dry out as the day gets warmer. I try to spray the cages so that they dry out
While Crested Geckos do not need constantly high humidity, babies dehydrate more easily and should be misted more regularly to make sure that they don't have shedding problems. On the other hand, I've noticed that reptiles that are kept too wet for too long can have shedding problems as well, so you still want baby cages to dry out periodically. I keep babies in Kritter Keepers, which have plenty of ventilation, so I can spray heavily and not have to worry about the cage becoming moldy or unhealthy.
So "what percent" you ask? There is no set percent. The temperature has a direct bearing on relative humidity and so do many other factors. As a rule of thumb, I try to lightly spray (not soak) everything in the cage every evening. The water from this usually evaporates within 4-6 hours.
In my experience, humidity is not at all vital (except in the first few weeks of life) to a Crested Gecko and is not a concern as long as the gecko is able to drink daily.
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Click here to go to my Crested Gecko FAQ
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Anthony Caponetto
www.ACreptiles.com