I cover three sides of my enclosures with plastic. I saw but didn't have time to respond that you were considering covering the front. That seems like a lot to me. I get my humidity up by fogging the area that they sleep. I can't get the entire cage that high but in the falling fog from the humidifier it has to be at least 90% probably higher. My hygrometer at the base of the cage will read 80ish when the fogger is on. Figure out where the sleep spot is and direct the humidifier out put down from the cage top above it. I run my humidifier from 12-5. with a couple half hours off at 12:30 and 4. If you live somewhere dry you might go longer.