Just purchased my first snake, a spider ball python the other day.
I am having some issues with temperatures. I have a fairly large tank (48x18x18) and having difficulty achieving proper temps.
I have an UTH that reads 90 degrees on top of the aspen bedding, and 95 degrees without the bedding (incase the snake digs under the substrate)
I noticed that with just the UTH the tank everywhere else was cold (72 degrees, the temp of my house) so I got a lamp and bulb. That puts the hot side at a ranging temperature of 85 degrees to 92 degrees (which is good correct)?

Anyways, the cool side is still pretty cool, between 72 degrees and 75 degrees maximum. However I am debating whether or not to just leave it alone because my ball python seems to be spending most of her time on the cool side (sleeping there ALL day, for the past couple days since I brought her home). She does venture to the warm side at night and into her hide on the warm side, but not nearly as often as she stays on the cool side.

Is everything ok?