You need the air moving all the time, that is why I mentioned it. If you can't do that then you are wasting your time heating the cabinet. The whole point of it is to have constant temperatures as much as hot temperatures.

You need to make the fan run all the time and turn the heat on and off. My Stratasyss have six 4 inch fans moving air about and they blow a gale, that is how it needs to be to make the temperature constant and hot all over inside the printer.