the single most important thing is that the temperatures for the ball python are within the acceptable temperature gradient. When I say gradient I don't mean that the entire cage can be somewhere in the middle of 75-90. It means that the cage should have one end around 75 and another end around 90. Your snake needs to have the ability to cool down or warm up by moving itself to either end. That being said, there are many ways to achieve this, and many people on here have particular opinions. If the whole trailer gets to 90, then the snake has no means of cooling itself as needed. When will your A/C be fixed? And no, do not use a heating element on a snake that is already at 90
I've always used a heat lamp for my ball python. Seems to be working
also, if you need to make a "quick fix" to the temps in your cage, get plastic water bottle. If you need to cool the cage down fill the bottle with cold water and place on the cool end. It will absorb the heat. Warm water on the warm end to heat up the tank. This is a VERY temporary solution