Mine runs 70-80% because it's an orchidarium with automatic misting system.
Mistking
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i have an old humidifier and I added a ultrasonic fogger in it. (i think the fogger is on longer than the 8 hours recomended...I don't know when it will fail...)
Easiest way to increase humidty is with wet towels. I put them on a rack above my heating vents