I'm having temp problems and need advice

[Bogertophis]

...Also the tank is a 20 gallon long, does that change anything? Should I put the UTH closer to the middle but not directly so the heat can reach both sides?

You always need to leave an unheated area for safety & for proper thermoregulation by your snake, so usually the UTH is at "one end", but in a chilly room, it might help a little if it was closer to, but not at, the middle. Also, I would suggest insulating the back & sides of the tank, also the lower part of the front, & part of the bottom except for under & near the UTH; insulation will help keep the heat in, but it's still going to be hard (if not impossible) to overcome a room that's too cold.

[Jakob_Ansel]

Thank you so much for the advice, what should I use for the insulation?
And yes I have put a lot of clutter in it. And you say several hides, so should I get more than just the two on the hot and cold sides? How much?

[Bogertophis]

Thank you so much for the advice, what should I use for the insulation?
And yes I have put a lot of clutter in it. And you say several hides, so should I get more than just the two on the hot and cold sides? How much?

You don't "need" more than 2 hides but it's okay if you do...snakes like choices, IF you have room for them. (warm, cool, & something in the middle, especially a humid hide is usually appreciated)

Many materials can be used for insulation, some easier than others to tape on & some look better than others. You can always tape on scenery first, then you won't really see the insulation.
Insulation can be corrugated cardboard, poster board (comes in black or white with a foam core), some ppl use styro-foam sheets cut to fit (messy to cut, but highest R value), sheet cork or cork tiles, even bubble wrap traps the air- which is how "insulation" functions.

[dakski]

Thank you so much for the advice, what should I use for the insulation?
And yes I have put a lot of clutter in it. And you say several hides, so should I get more than just the two on the hot and cold sides? How much?

In a 20L, two hides is probably fine. I don't have a lot of clutter in my BP's tank, but I have 3 hides. My BP is 8 years old and 2KG, so I have two appropriate sized hides for her on each side (warm side and cool side) and a bigger hide that's not as snug, just to clutter up the middle of the tank. She doesn't use it much, but makes her feel more secure. Her tank is 4X2' so there's room for a big bowl, and the three hides, while still giving her room to maneuver around the tank.

If you don't want three hides, you can also put a bigger water bowl in the middle to clutter up the tank. It's not about clutter per se, as much as making them feel secure. If they can touch something at all times and curl up around something, they feel safer.

One thing to note is if you have two hides - one warm and one cold, they should be identical and snug. You never want a snake to choose safety over proper thermo-regulation. By offering identical hides on each side, your BP will choose based on temp and their needs regarding temps, not by what hide feels safer to them.

If you are not sure what are good hides, ask, but I like the plastic hides with the offset doors. All my snakes love them (appropriate size for the snake in question) and they are super easy to clean and keep clean because of the smooth plastic.

https://www.reptilebasics.com/hide-boxes

These are sold elsewhere, but I get mine from Reptile Basics. They ship, but also go to many reptile shows, well, at least pre-covid.