Thank you for the reply! Knowing the rack i want to get either a DIY or a Retail rack, i will make sure the bottom of the tubs are insulated. CURRENTLY i have Styrofoam boarding under my ten gallon which allowed for some insulation to heat the hot spot to the desired temp. I can understand something with a lot of air circulation can cause what you explained to happen. A rack with 5 sides covering the tub with enough air flow to provide oxygen to the reptile is what i will be after. NOT a rack system that leaves the tubs exposed.
With that said its not a question of getting the basking spot to desired amount. Its a question of in this theoretical situation the basking spot IS 90 Degrees and the ambient air temp is like 70-75 is their any harm for the temperature being that low. Now at first read you would assume well the floor on one side would be 90 and then the air 70-75 but in reality the heat coming off the floor and the humidity will help bring the ambient air temps up as well. SO the snake will still have a place to thermo-regulate from 70-90 degrees which i don't see a problem? If the snake is provided the heat it needs and if it gets too hot it will move away?
Also this is only 1/4th of the year this would happen which I've read multiple places females and balls in general eat less and are conditioned by nature to adjust to the climate change. Its known in some parts of Africa the temperatures to get down to 50 degrees ...
Also from the above quote from the unknown retailer brings up a good debate. I understand the conditions that KEEPERS have set up and observed optimal behavior. This optimal behavior is not REALISTIC these are human controlled equilibrium we have set up. Any given day out in a natural habitats will their warm spot stay 90 degrees or their cool spot stay 80 degrees.
With that said this whole question basically loops back to has anyone done this?