My brother got one from christmas but we can not get the internal temp of the smoker below 220 even with the burner set on the lowest setting.
You can also leave your door open a little to let some heat out but you'll also leave out some smoke.Your brother could try to keep the vent at the top wide open - that would allow more heat to escape, but at the sacrifice of smoke also. You may burn more chips in doing so...
I agree with one of the previous posters - you may look into a needle valve. That could allow you to cut the flame down to a trickle. The only downside would be that if there were any wind at all you could easily blow-out the flame.
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Good luck!