75 is cool for sure what is the AIR temps? they are more concerning than cool surface temps. Raising the cool end temp is not as easy as it sounds, there is no 'this will fix it answer', too many variables.

What type of enclosure do you have?

What is it made of?

How large,how tall?

I am guessing it is an open toped tank? With tanks you have a great advantage in that it is heavy that helps. If this is the case you can insulate the back sides and some of the top (over the warm end) that may help. Raising the room temp is the easiest solution, although not practical for one snake. If you include a fluorescent light inside the enclosure (like hung off the top edge) that will increase the temps with out adding a massive burn issue make sure the snake cannot contact it for long lengths of time and it is fine.

If you are going that far however this might be a viable option. The lower height and close top make it easier to heat add a fluorescent light and usually the cool end temps hold well.

http://ball-pythons.net/forums/showt...arium-Solution

http://ball-pythons.net/forums/showt...arium-Solution