I keep mine at 81 degrees, but in the past it has fluctuated between 72 and 85 (one broken and one overactive heater), and they've never seen to be affected negatively by those different temperatures...
If find that my Serras are most aggressive, alert and active at 78-79, of course.. I dont own a rohm, but each P has a pefect temp although they can tolerate a wide range.
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