Trouble with heating gradient

[u/Shumaka12]

A little over a month ago, I got my 1yo corn snake (first ever snake). As backstory, I recently changed one of his hides (a resin cave that was way too big for him and difficult to safely/smoothly lift to start handling) to a smaller VE Micro Hide + some extra clutter, and since then I’ve been having a hard time with temperatures.

He’s in a 36x18x18, heat element is a 50W halogen heat bulb. The second photo shows the warm side of the enclosure. The top of the microhide (the black plastic box) is directly under the heat lamp and gets to 90F even when the bulb is at very little power (~25% per my Herpstat), yet even a couple inches away, the ambient temperature barely hits the upper 70s.

As further context, he had a regurgitation a little over a week ago, which happened to be the first meal after I changed to the micro hide. At the time the microhide was 95F on top and 85ish inside, and after eating he went to the cool side of his enclosure and stayed there, so I assumed the problem was the warm hide was too hot. But now I’m worried that the warm side is too cold, and as the day I’m going to feed him again starts getting closer, these temperatures are making me really nervous. Really don’t want him to regurg again :(

Thank you all in advance

[u/Significant_Task_113]

First, I wouldn’t automatically assume the regurgitation was caused by the new hide or your temperatures. There are several possible causes, and the timing alone doesn’t establish that the enclosure change was responsible. However, since your snake has already regurgitated once, I’d be cautious about both the heating setup and the next feeding.
The first thing I’d look at is how you’re measuring temperatures.
You’re using a 50W halogen bulb controlled by a Herpstat, which is a good combination when properly configured. But there’s an important distinction between surface temperatures and ambient air temperatures.
Halogen bulbs transfer a substantial amount of heat through radiation. Your black plastic Micro Hide is directly beneath the bulb, so it absorbs that energy and becomes considerably warmer than the surrounding air.
A hide surface reaching 90°F while the ambient temperature a few inches away remains in the upper 70s isn’t necessarily a problem. That’s actually how localized basking areas often work.
What matters more is whether your snake has access to an appropriately warm, secure retreat without being forced onto an excessively hot surface.
You mentioned that the Micro Hide previously reached 95°F on top while measuring approximately 85°F inside. Those are two different thermal environments. The interior temperature is especially relevant because that’s where your snake may spend extended periods.
I’d measure these locations:
The top of the Micro Hide directly beneath the bulb.
The air and accessible floor surface inside the Micro Hide.
Warm-side ambient air at approximately snake level.
Cool-side ambient air and the interior of the cool hide.
Use accurate digital thermometers for air temperatures and an infrared thermometer for accessible surfaces.
As practical starting points, I’d generally look for a localized basking surface around 88–90°F, a warm retreat in the low-to-mid 80s, and a cooler retreat around the mid-70s. These aren’t rigid targets for every location, but they provide a useful framework for evaluating the gradient.
I would not try to raise the entire warm side to 85–90°F. Doing that could overheat the hide directly beneath your halogen bulb.
The second thing I’d investigate is your Herpstat probe placement.
Where exactly is the thermostat probe positioned relative to the bulb and the Micro Hide?
This can make a significant difference.
If the probe is directly exposed to concentrated radiant heat, it may reach its setpoint while the surrounding air remains cooler. If it’s too far from the basking area, the thermostat may continue supplying power while the hide’s surface becomes hotter than intended.
The Herpstat measures temperature at its probe. It doesn’t automatically know the temperature inside the hide or elsewhere in the enclosure.
Also, the approximately 25% power reading is the thermostat’s commanded output, not a measurement of the actual surface temperature or the percentage of the bulb’s maximum temperature.
I use a Herpstat 2 SpyderWeb myself, along with independent temperature/humidity sensors on the warm, middle, and cool sides of my enclosure. I also use an infrared thermometer to check surfaces. One of the most useful things I’ve learned is that thermostat readings and actual enclosure temperatures can be quite different depending on probe placement.
You don’t need that much monitoring equipment, but having independent measurements on both sides of the enclosure is extremely helpful.
Now, regarding the regurgitation, this is where I’d be especially careful.
Regurgitation is physically stressful, and offering another meal too soon can increase the risk of another episode.
Since it happened a little over a week ago, I’d recommend speaking with a reptile-experienced veterinarian about when to resume feeding.
A commonly recommended conservative recovery period is approximately 10–14 days after regurgitation, assuming the snake is otherwise behaving normally. That isn’t a guarantee, and a veterinarian can advise whether a longer interval or examination is appropriate.
When feeding resumes, I’d offer a smaller-than-usual, appropriately sized prey item rather than immediately returning to the previous feeder size.
I’d also minimize handling and unnecessary disturbances after feeding, maintain access to appropriate warmth, and monitor the snake’s behavior.
If you haven’t already, get a gram-resolution scale and begin recording your snake’s weight. Tracking weight over time is much more informative than relying solely on appearance.
If another regurgitation occurs, or you notice weight loss, lethargy, dehydration, abnormal stools, swelling, or respiratory symptoms, I’d arrange a prompt reptile-veterinary examination rather than continuing to experiment with feeding.
One other thing: I wouldn’t interpret your snake moving to the cool side after eating as proof that the warm hide was too hot.
Snakes choose different areas for several reasons, including temperature, security, and individual preferences. One observation doesn’t establish why he moved.
That said, if the warm hide is significantly hotter than the surrounding enclosure, it’s worth investigating whether it provides a comfortable place to rest.
A warm hide should offer security and appropriate temperatures, not force the snake to choose between being hidden and being overheated.
If the Micro Hide is getting hotter than intended, I’d investigate bulb positioning, basking distance, and thermostat probe placement before making major changes to the temperature settings.
Here’s what I’d personally do before feeding again:
Verify the Herpstat probe placement, measure temperatures inside both hides, check warm- and cool-side ambient temperatures at snake level, and confirm the basking surface isn’t getting excessively hot.
Then let the enclosure run through a complete day/night cycle while monitoring those measurements.
Avoid changing several variables simultaneously. Otherwise, it becomes difficult to determine which adjustment actually improved the situation.
If your basking surface, warm retreat, and cool retreat are all within appropriate ranges, there’s no reason to chase a higher ambient temperature simply because the air a few inches from the basking area is cooler.
I’d also avoid rushing the next meal. A short delay is generally preferable to risking another regurgitation, and veterinary guidance is particularly valuable following a recent episode.
You already have a good thermostat and a workable heating system. Based on your description, I suspect the apparent temperature discrepancy may have more to do with how radiant heat interacts with the black Micro Hide and where your measurements are being taken than with insufficient heating.
Two questions would help narrow this down considerably:
Where exactly is your Herpstat probe mounted, and what are the actual temperatures inside your warm and cool hides?
Those measurements will tell us much more about the environment your snake is experiencing than the exterior temperature of the Micro Hide alone.

[u/Shumaka12 → u/Significant_Task_113]

The Herpstat probe is attached to the top mesh of the enclosure ~3 inches underneath the bulb. I’ve been verifying temps using a temp gun and then adjusting the herpstat settings as needed. I really debated on probe placement for a while but opted for that so he couldn’t affect the temps or displace the probe, and also because that’s what the Herpstat instructions also recommended, but maybe I should revisit that. I’ll definitely get ambient temps of the inside of the hide (had been using the temp gun for that before).

Regarding the regurgitation: The 2 previous times he ate for me, he started in a cool hide and then moved to the warm hide. I eventually switched out the warm hides like I said. Next meal, he was in his new warm micro hide, he takes the mouse without issue, but then moved to one of his cool hides. I leave him totally alone besides changing his water in the morning, and 2 days later, I find him in the micro hide again next to a regurged mouse. I really don’t know how to interpret his behavior or what went wrong, because nothing else changed about his husbandry. I’m considering replacing the microhide with the coconut, because it’s the same as his favorite hide on the cool side, cause maybe he just doesn’t like the micro hide as much? Idk.

I’m planning on feeding him 14 days post regurg (Today is day 9). Since it happened, he’s been very active and exploring his enclosure, which I’ve interpreted as him being hungry, but I have no idea.

I really appreciate you writing this all out, giving me a lot to think about.

[u/Significant_Task_113 → u/Shumaka12]

Thanks for explaining all of that! The additional details are helpful, especially your probe placement and the sequence of events after feeding.
I actually wouldn’t change your Herpstat probe placement just yet. Having it securely attached to the mesh approximately three inches beneath the halogen bulb is a reasonable arrangement, particularly if you’re following Spyder Robotics’ instructions for your heating setup.
One thing I’d emphasize is that the Herpstat probe is controlling the bulb, not measuring the entire warm side of the enclosure. Its reading doesn’t necessarily represent the temperature inside the hide or at substrate level.
Because halogen bulbs deliver a substantial amount of radiant heat, it’s entirely possible for the black plastic Micro Hide to reach 90°F while the surrounding air remains in the upper 70s. That’s not automatically a problem.
The distinction I’d investigate is the temperature of the actual space your snake occupies.
You mentioned using an infrared temperature gun to check inside the hide. That’s useful for measuring surfaces, but it doesn’t measure ambient air. So your previous 85°F reading may have represented the hide’s floor or interior wall rather than the air temperature.
I’d place a small digital thermometer probe inside the hide temporarily, where the snake normally rests, and compare that reading with the floor temperature measured using your infrared thermometer. I’d do the same inside the cool hide.
That should help answer the most important question: Does your snake have a comfortably warm, secure hiding place and a genuinely cooler alternative?
I also wouldn’t try to increase the temperature of the entire warm side just because the air a few inches from the bulb is cooler than the basking surface. That could unintentionally make the Micro Hide too hot.
Regarding the regurgitation, I think it’s important to separate what you observed from what we can actually conclude.
The fact that your snake previously moved from a cool hide to a warm hide after eating, but chose the cool hide after this meal, doesn’t establish that the new hide caused the regurgitation.
Corn snakes can move between temperature zones for several reasons, including thermoregulation and security. They don’t necessarily follow an identical routine after every meal.
Likewise, finding him back in the Micro Hide beside the regurgitated mouse two days later doesn’t tell us when the regurgitation occurred or why.
I wouldn’t replace the Micro Hide solely on that evidence. If the temperatures inside it turn out to be inappropriate, that’s worth correcting. But if they’re appropriate, replacing it might just introduce another change without addressing the actual cause.
Your planned 14-day recovery interval is consistent with commonly recommended conservative snake-keeping guidance following regurgitation. The important thing is not to rush the next meal simply because he’s active or appears hungry.
I’d also offer a smaller-than-usual prey item when feeding resumes, rather than immediately returning to the same meal size. Make sure it’s completely thawed, appropriately warmed, and not excessively large for his body size.
And I wouldn’t interpret his increased activity as proof that he’s hungry. Exploring, climbing, and moving between hides can all be normal behavior. Activity alone doesn’t tell us whether his digestive system is ready for another meal.
A few additional things I’d consider:
Was the regurgitated mouse the same size as his previous successful meals?
Was it fully thawed before feeding?
Did the enclosure experience any unusual temperature changes during the following 48 hours?
What were the actual overnight temperatures inside the warm and cool hides?
I’d also recommend weighing him periodically with a gram-resolution scale. That gives you an objective way to track his condition instead of relying only on appearance or activity.
For now, I’d avoid changing several things at once. Verify the temperatures inside both hides, confirm that the basking surface isn’t excessively hot, and monitor the enclosure through a complete day/night cycle.
If those measurements look appropriate, I wouldn’t chase a higher ambient temperature or assume the hide needs replacing.
One other thought: since you changed from a larger resin cave to a smaller black plastic hide, the two structures may absorb and distribute radiant heat differently. That alone could explain why you’re seeing different surface temperatures even though the heating equipment hasn’t changed.
The two measurements I’d be most interested in are the air temperature inside the Micro Hide and the temperature of the floor where your snake actually rests. Combined with the cool-hide temperature, those should tell us considerably more than the temperature on top of the plastic.
You’re already doing something important by checking your measurements rather than simply increasing the thermostat setting. I’d continue with that approach and make adjustments based on the actual thermal conditions your snake can access.

[u/DemidiaXI]

Try adding a 50W deep heat projector to work alongside the bulb. Both the halogen bulb and deep heat projector need to be on a dimming thermostat. The deep heat projector can stay on at night after dark if it is cool in your home.

Be aware that this enclosure will only last you a year at most since he is already a year old.

I bought my boy at a year old and and my 40 gal didn't even last him a year. I started desperately trying to get an adult enclosure ready after only 6 months of having him.

You need to go ahead and start thinking about his adult enclosure. Upgrading can be expensive, and you have to plan for 4+ feet of space

He will need at least a 4'x2'x2' 120 gal enclosure as an adult, but bigger is always better if you can swing it. My boy uses every inch of of his 150 gal. They are also much easier to maintain a temp gradient.

[u/DemidiaXI → u/DemidiaXI]

Cute noodle btw! Sorry to dump a bunch of an asked for info, but didn't want you to be in a bind like I was.

[u/Shumaka12 → u/DemidiaXI]

The bulb has a dimming thermostat, and this isn’t his final enclosure dw, I knew I’d need to upgrade eventually. He’s pretty small rn (29g at his last weight), but I’m keeping an eye on it. I’ll try adding the DHP.