Living in a student room as well, I keep the heater somewhere in between 2 and 3. No idea how many degrees Celsius that is, though, let alone Fahrenheit.
But I always set the heater so that it's comfortable. I usually aim for 20°-21°, but if it feels too hot or cold then I adjust the heating accordingly (if I don't feel like putting on a sweater or something).
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I'm about as subtle as a flying brick.
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