I'm sorry, I now know you're a teenager, but if you had done plenty of research you'd know the importance of a thermostat. It's literally on almost every care sheet.
Running heating equipment unregulated is dangerous to the snake. Those lamps can spike to dangerous temps which can result in neurological damage or even death.
A thermostat is literally the most important piece of equipment you can have.
Please do your snake a favor and explain to your parents that your snake NEEDS a thermostat ASAP. A thermostat is less expensive than a vet visit and it's only fair to your pet that you keep it safe.