Looking for opinions/ideas on a humidifier and heater

Opis:
I have an 8 foot by 3 foot by 18? high enclosure thats lined with corrigated plastic and siliconed Plus I made a lid with the same material to try and keep the humidiy and heat up. The room that its in is 55% humidity and 72-76 degrees constant with my aquariums running. I have a large water pan, and my cypress much gets sprayed ever other day that keeps it up to 80% but I notice its really wet on the bottom layer and I dont want it like a swamp or they will get shell rot so Im thinking of a humidifier. I would like to run it ontop or beside the tank with a PVC pipe like a spray bar running the lenght of the tank with holes.... What kind and size of humidifier would I be looking for to do this? Also the heat in there is 74 on the cold side and 95 under the lams so I was thinking to used a ceramic heater in the middle and get the constant temp up to 82 with a dimmer switch? Is that how you guys do it? Also I have holes cut in the lid