First, relax. A constant temp of 85*F is ok for a ball python without any additional heat. So, unplug the heat sources for now, until you can get thermostats. Just keep in mind that if your house cools off at night you will need to provide supplemental heat.
Second, the humidity. You can wrap the screen top in almost anything - aluminum foil, plastic wrap, etc - to keep humidity up. Just leave opposite corners open a bit for ventilation, and use a wide, shallow water dish that allows a lot of water to evaporate.
Third, the corn snakes. Not sure if a constant 85*F is ok for them or not, I keep my colubrid's ambient temperatures a touch cooler than my boas and pythons. They reportedly soak to cool off if they get too hot, so give them a water bowl large enough to do that.
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