If you use a thermostat on your heating then they should switch off automatically if temperatures get above your desired level.
A good thermostat and thermometer is probably the best investment you can make in keeping your animal happy and safe.
Good ventilation and maybe a larger insulated hide at the cool end with some sort of cooling (frozen gel pack?) wrapped in a towel. Small pedestal fan with a wet cloth or chilled water bowl in front blowing towards an intake vent maybe. Just have to make sure with that method you keep a handle on the humidity level I suppose. A water bowl in the cool end deep enough for snakey to have a dip.
I'm sure you'll sort it out.