Here are two posts I've made in the past with regard to humidity in glass tanks. They will solve your problem and eliminate the hassle of misting or whatever. I find I only need the sphagnum moss in the shed and I have a particularly dry ambient humidity in my house in the winter due to wood heat. Towels over the screen leave too much screen exposed and are a fire hazard with CHE's.
You will never get the humidity up with an open screen top. Best way is to cut a piece of marker board or masonite to fit over the screen. You can cut a six or seven inch hole in it for your heat lamp. Don't worry about putting any air holes in it, it isn't going to fit close enough to suffocate your snake. This is a much nicer solution than messing around with tin foil or towels. Your water bowl will provide enough humidity, though you will want to add some damp moss or something during shed.
I see frequent references to humidity problems in various posts. I have a solution that has worked well for me. I use the New Zealand sphagnum moss that you see on some suppliers websites. Get one of those mesh bags that fruit or other things come in at the grocery store. Tie up a ball of the sphagnum moss in the mesh bag about the size of a tennis ball and wet it thoroughly. It will hold a lot of water and will maintain the humidity for three or four days. A lot easier than misting or whatever. I have used one of these for six months and have seen no signs of mold, but it would be simple to change the moss if mold occurred.
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