Thermostats are absolutely. Neccessary. Right now your temps are way higher than you think. My guess is that hot spot is pushing 110 degrees. You should really Turn it off until you get that thermostat, otherwise you Will burn your snake if they get to the bottom and stay on that heat pad. It's summer, they will be fine for a few days without heat. Even if you just go buy a cheap temperature dialer at the pet store that will be fine for. NOw until you get a nice one.