I'm also curious, what are you using to measure the humidity? As far as devices go, I had a trickier time getting an accurate measure of humidity compared to temperature. My sibling (who has a crested gecko) and I both started with the ZooMed digital thermometer/hygrometer combo. Both seemed fairly accurate to temperature when checked against IR temp gun readings, but the humidity readings on mine tended to fluctuate erratically, while my sibling's stayed stuck at a faulty 10% humidity reading regardless of where they placed the probe or how much they misted the enclosure. We're using Acurites now and are much happier with them, in terms of both accuracy and the level of detail in the displayed measurements.