Not sure what a 'sand mat' is, but your UTH really NEEDS to be controlled so it's not too hot. Try running your UTH just with a lamp dimmer (aka rheostat)...they're cheap
& available in any hardware store. Get the kind with the control installed on an extension cord, & when you replace with a thermostat, you can always use the dimmer for
a lamp.A lamp dimmer is WAY cheaper than the vet will be when your snake gets burned, & you won't have to feel guilty for causing so much pain either.
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