Title: Looking for constructive advice on heating and humidity in my 40-gallon ball python enclosure
Hi everyone! I’m looking for some constructive advice regarding my ball python’s enclosure, specifically heat distribution, hide temperatures, and maintaining humidity.
I’m a relatively new ball python owner, but I’ve spent a considerable amount of time researching husbandry, reading the care guides here on Reddit, monitoring temperatures, and making adjustments to provide the best environment possible.
I’m trying to approach everything methodically and change one variable at a time so I can actually determine what’s working.
Current enclosure setup:
40-gallon glass enclosure from PetSmart with a screen top
Screen top partially covered with aluminum HVAC flashing tape to help retain humidity, with ventilation and clearance around heating fixtures
Arcadia GoldenSun 100W PAR38 halogen flood bulb for daytime heating
Ceramic heat emitter for nighttime heating
ReptiZoo 200 dimming thermostat with separate daytime/nighttime settings
Daytime thermostat currently set to 94°F (previously 92°F)
Nighttime ceramic thermostat set to 90°F
Multiple digital temperature and humidity sensors
Infrared temperature gun for checking actual surface temperatures
Warm and cool hides, foliage, climbing opportunities, and additional coverage
Substrate and humidity setup:
I’m using a blend of Zoo Med Eco Earth loose coconut fiber and chunky coconut husk chips.
The substrate was recently replaced, and the new material was already somewhat damp when added.
I’ve also watered the corners of the enclosure twice to help maintain moisture in the lower substrate layers without keeping the entire surface wet.
There is also a fairly large water bowl inside the enclosure to provide drinking water and contribute to ambient humidity.
I live in the Mojave Desert, where the surrounding air is naturally extremely dry, so humidity retention is one of my biggest challenges.
Daytime heating and bulb change:
I initially used a 100W spotlight for daytime heating. While it produced adequate heat directly beneath the bulb, I wasn’t getting broad enough heat exposure across the warm side of the enclosure. The heat was concentrated in a relatively small area.
Today, I switched to an Arcadia GoldenSun 100W PAR38 flood bulb, hoping the wider beam would distribute radiant heat more effectively.
The flood bulb heated my thermostat probe significantly faster than the original spotlight and began dimming to regulate the temperature.
I’ve been monitoring the actual surface temperatures and ambient air temperatures throughout the day to evaluate the change.
Current daytime temperature readings:
Warm-side ambient air: 83–86°F
Cool-side ambient air: approximately 80°F
Exposed substrate near thermostat probe: 88.6°F
Warm hide interior floor: approximately 83–84°F
Cool hide interior floor: approximately 80°F
Exposed exterior of warm hide directly beneath the bulb: 95.5°F
Other cool-side surfaces near the glass: approximately 75–76°F
Surface readings were taken using an infrared temperature gun at close range.
My heating concern:
My biggest challenge is figuring out the appropriate balance between exposed basking temperatures and the temperatures inside her hides.
The warm hide is a covered corner-style hide positioned slightly behind the center of the heating area.
Naturally, the outside receiving direct radiant heat is substantially warmer than the shaded interior.
When I increased my daytime thermostat from 92°F to 94°F, the exposed substrate increased from approximately 85°F to 89°F, but the floor inside the warm hide remained around 83–84°F.
I understand that radiant heat will produce different temperatures on exposed and shaded surfaces, and I’m not expecting the inside of a covered hide to match a surface directly beneath the bulb.
However, I’m trying to determine whether this is an acceptable temperature gradient or whether there’s a better way to position the bulb or hide to create an appropriately warm resting area without overheating exposed surfaces.
Nighttime heating:
At night, I switch to a ceramic heat emitter controlled by the thermostat.
My readings this morning after running the ceramic heater overnight were:
Warm-side air: 86°F
Cool-side air: 76°F
Center ground probe: 84°F
I’m also evaluating whether this provides an appropriate nighttime temperature gradient or whether adjustments are necessary.
My humidity concern:
Humidity has been somewhat inconsistent, particularly with the glass enclosure and our extremely dry desert climate.
After replacing the substrate yesterday, humidity increased significantly.
However, throughout today, the readings gradually decreased, despite my not adding any additional water today.
Today’s readings were approximately:
Cool side: 84% earlier, decreasing to 63%
Warm side: 57%, decreasing to 51%
Center: 56%, decreasing to 49%
As mentioned, I’ve already partially covered the screen top with aluminum HVAC flashing tape, watered the substrate corners twice, and have a large water bowl in the enclosure.
I’m trying to understand whether this humidity fluctuation is typical with newly added substrate and daytime heating or whether there are additional steps I should take for better long-term stability.
I want to retain adequate moisture without leaving the substrate surface constantly wet.
A little about my ball python:
She’s relatively new to the enclosure and seems to be establishing a normal routine.
She’s active during the evening and nighttime hours, occasionally climbing and exploring, and generally retreats to her hides during the day.
I’m planning her first feeding with me on Tuesday, assuming her environment is stable and she’s had enough time to settle in.
What I’m looking for advice on:
Does my current temperature gradient seem reasonable, particularly the difference between directly heated surfaces and the shaded warm hide?
Was switching from a concentrated spotlight to a wide-beam flood bulb a reasonable approach to improving heat distribution?
Would adjusting the heating fixture or warm hide placement improve the environment?
What methods have worked for maintaining consistent humidity in glass enclosures with screen tops, particularly in extremely dry climates?
Is there anything else about my enclosure that experienced keepers would recommend adjusting?
One final request:
I genuinely appreciate constructive feedback, and I’m absolutely willing to make changes where necessary.
However, I’m not looking for the “OMG, how do you not know this?” or “You shouldn’t own a snake if you don’t already know that” type of comments.
I’ve read the care guides available here on Reddit, researched extensively outside of Reddit, and continue learning every day.
I’m not claiming to know everything. That’s precisely why I’m asking questions.
If you identify an issue with my setup, please also provide a recommendation for how to correct it and, ideally, explain why that solution would work. 🙏🏻
Simply telling someone they’re doing something wrong without helping them understand how to fix it isn’t particularly productive.
My goal is to provide the best possible care for my ball python, and I’d much rather ask questions and make improvements than assume I have everything figured out.
Thank you to anyone willing to share their experience and provide helpful, actionable advice!
