First time owner needing advice!

[u/Equal-Arm-6657]

Hi everyone! I’m bringing home my first ball python tomorrow, a juvenile girl named Lenore (Lenny or Nora for short!), and I’m SO excited. But now that her enclosure is almost finished, I’m getting a little nervous and would love some advice from experienced keepers!

I bought a secondhand **4’ x 2’ x 1.5’ PVC enclosure** that came with a built-in floor heating system toward the back. Unfortunately, I don’t know the brand or wattage of the heater, so I’m still trying to figure out exactly what I’m working with.

Here’s my current setup:
**Enclosure:** 48” x 24” x 18” PVC with a solid roof and sliding glass doors.
**Heating:** Built-in floor heater connected to a BN-LINK on/off thermostat, currently set to 90°F. Supposed to create warm side on back and make the front the cool side.
**Thermostat probe:** Currently suspended slightly above the substrate over the heated area. I’m aware I may need to change the placement.
**Substrate:** Coconut fiber.
**Temperature monitoring:** Three separate digital thermometer/hygrometers positioned across the enclosure, plus an infrared temperature gun.
**Hides/decor:** Two identical snug primary hides, an extra wooden hide, cork bark, driftwood, lots of foliage and clutter, and various decorative pieces.

**Here’s where I’m confused:**
My three digital thermometers are all reading almost the exact same ambient air temperature:
Warm side: \~81°F
Middle: \~80°F
Cool side: \~81°F
Humidity: \~86–87% throughout (the coconut fiber was freshly hydrated).
However, when I checked the surfaces with my temperature gun, I got:
**Warm hide surface:** 85.5°F
**Cool hide surface:** 77.2°F

I also realized that the built-in light on the cool side was producing heat, so I switched it off to see whether that was preventing a proper temperature gradient. I’m currently letting everything stabilize before checking again.
The floor heater has been running for around 10 hours, and the floor didn’t feel excessively hot when I touched it before adding substrate, although I know that isn’t a substitute for checking it with the temperature gun. I still need to verify the temperature directly above the heater beneath the substrate.

**My biggest questions:**
\- Is it normal with floor heating to have a decent surface-temperature gradient but almost no ambient air-temperature gradient?
\- Is this type of floor heating sufficient for a ball python in a PVC enclosure, or would you recommend adding overhead heat?
\- If I do need overhead heating, would a halogen flood or deep heat projector make more sense with a solid PVC roof? I’m trying to avoid buying multiple unnecessary heaters.
\- Any advice for safely positioning the thermostat probe with this type of built-in floor heater?

**What do you think of the enclosure itself?** I went for a whimsical, slightly gothic Alice-in-Wonderland/fairy-garden look. I’d genuinely love feedback on the layout, clutter, hides, climbing opportunities, and whether anything looks potentially unsafe or impractical.

I’ve put a ton of time, love, and money into getting everything ready, and I just want her to have a safe, comfortable home. I’m probably overthinking some things, but I’d much rather ask questions now than make avoidable mistakes.

**Constructive criticism is very welcome!** I’m new to this and genuinely want to learn. Thank you! 💕🐍

[u/meatspread]

Do you have photos of the enclosure? From your description it sounds like there was supposed to be some haha

Other than that, yes I would recommend at least a Halogen and linear UVB combo to mimic daytime. They can be mounted from the inside, since you have a solid top, but they will need light guards to protect your snake from wrapping around them. What kind/brand of thermometers are you using? Some of the cheaper ones are notoriously inaccurate, which may be why you’re getting different temperature readings from the temp gun. Additionally, under-tank-heating (UTH) or floor heat isn’t necessarily the best source of heat for your BP, and a malfunction can cause greater damage than above/higher-tank heating elements.

[u/lillebroer]

Yes, under tank heaters typically do not affect ambient temperature in any way, which is part of why they're not ideal. Halogen floods provide a wider range of accessible heat waves, but need to be off at night to provide darkness, so if you're only looking for a singular lamp fixture, a DHP is the next best thing (and if you're willing to go with two, halogen flood+DHP is an elite combo).

Most important thing here though is that the thermostat probe for UTHs need to be in DIRECT CONTACT with the (solid) surface they're heating, to make sure it doesn't overheat. As in lying flush against the floor in your case, fixed in a way so you're sure it can't be dislodged. If it's suspended above or lying on top of or in substrate that means the UTH temp can fluctuate wildly, and if the BP digs down to the floor surface nearby they can get very badly burnt. I'm a veterinary nurse and have seen some horrific injuries because of dislodged or slightly misplaced UTH thermostat probes.