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The airline is actually attached to an aqualifter, which keeps the air out of the overlfow. HOBs definitely allow for more of a chance of overflow... overflowing. You can use enough high/low water sensors to overcome this, if you're creative.
This time of year, unless you keep your house really cold, I'm sure the temps aren't going to be outrageously low in your tank. If it is at least 75 I think you'd be ok.
Thanks again, Ralph. Your tank looks great and we had a wonderful time. The kids really enjoyed themselves in the pool. Thank your wife for the great food and wonderful hospitality.