Remember that our body temperature is roughly 98.6* F. which is too hot for any place in a snake's enclosure. To "feel warm" to us means it has to be HIGHER than our body temperature.
You cannot rely on how it "feels" to make sure it's safe for your snake! USE AN ACCURATE THERMOMETER- ALWAYS.
You cannot rely on what a thermostat is "set to"- always read independently what it REALLY is.