Regardless of where you live it really depends on the ambient temperature in the room your snake is kept in.
If the temps in the room are always between the high 70s and the mid 80s you can get away with just providing belly heat.
Otherwise, you'll need an additional heat source, regulated by a thermostat or rheostat. Properly regulated heat sources will not fluctuate and will not run the risk of dangerous heat spikes.
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