I don't know how to effectively reply to posts on here I'm not used to the site but.

@Kira - I know how important a thermostat is... I'm not a very experienced owner (this is my first snake) but I tried to become very educated before I got him. I'll try again to convince my parents to get one. They might since he's now not eating. Thanks for the link to a cheap one! I'm not going to lie, the humidity is probably kind of low. It's hard to keep his tank humid because it'v very deep + I have the lights. I do have a cool mist humidifier but it's not always on because it sometimes creates mold. I know it's not the most ideal set up. If it helps explain the situation I'm a high school student and I'm going to what's pretty much a boarding school for the next 2 years. I plan on getting him a whole new setup when I get my own place and a job. I want to get him a new tank and better heating system.
I can't get a pic of his set up because I'm away from home. I know usually a feeding problem has to do with husbandry but I can't notice anything that's changed other than me being gone. As for his setup I think he should feel secure enough. His hides are a little large for him but they're completely dark, solid domes with one opening. He also has the plants and stick in there. Between all that and the large water bowl there really isn't much open space except vertically.

@Sunnieskys - Thank you! I plan on trying that to see how he reacts. I'm going home in a week.

@MissterDog - As I've stated above the lack of a thermostat is really not my choice. I'm not really convinced that it's safe right now. Really the reason I've put a liner on top of the glass and tested it is because I'm very worried about it. He started burrowing a little within the last year and I freaked out and rearranged his whole tank to try to make it safer. I can't afford to get a better setup at the moment but I am working toward it. I don't want to seem irresponsible I really have done my research and I probably wouldn't have been as willing to get him in the first place if I knew I couldn't have a thermostat and ideal tank but my parents got me everything as a present one year. I know the risks and that's why I'm always worried. I plan on getting a better setup as soon as I can. There's no way I can get a better tank right now but I'm trying to get my parents to buy a thermostat. Right now I've made the tank as safe as I possibly can with what I have. I'm genuinely thankful for the concern, though.
Also I'm not actually sure if my parents have been handling him. I know they've been taking him out but I haven't checked to see if they're taking him out too close to feeding time. Thank you!