Ok you are right I did miss your point. I would suggest that as warm air rises and creates thermal currents that if there was much more than one degree no matter where you take an air temp reading it is not an ambient temp reading anyway. Often people claim ambient air temp gradients but by definition that is not a ambient measurement. Typically they are still measuring temps of a heater either directly or in directly. The air will move inside the enclosure and end up mixing.

I am fortunate to work with two very good vets, recognize what most vets don't husbandry is key to health and take an active hand in monitoring the enclosures.