Halogen, DHPs and RHPs are all viable options for BPs, and CHE can help as an auxiliary heat source on the cool side to help boost overall ambient temps (but not just as good as a primary heat source as it can lower humidity more). Honestly, what will make more of a difference is less the choice of heating, and more the choice of viv.  Solid top melamine coated wooden vivs or insulated PVC vivs with glass doors are the way to go.  They are my only options where I live, nothing else would be able to hold heat enough over winter.  If your viv doesn't hold heat well, you'll struggle regardless of heat source type/combination. 

Mesh top glass vivs are shite for humidity, and also don't hold heat well. Steer clear.  The humidity aspect can be improved by covering the top in foil or HVAC tape aside for the heat sources, but the insulation will still be an issue for someone living in a colder climate, unless you add insulation panels to the whole viv except the front, in which case... Better to just buy a more suitable viv for your climate to start with.  Slightly more expensive maybe, but completely worth it. 

Those temps are a bit low for outside handling time, but not drastically.  Mine are lower.  My snake room is 14-15 in the winter, the rest of my house around 10, sometimes less. If I wanting a handling session, I turn up the heat and blast it for around half an hour before I intend to handle, to boost it up. Sometimes have also had to turn the oven on in the kitchen and open the oven door to bring it up enough, but that's not common. 

Should be fine in the summer.  Even if the temps are a bit lower than in their viv, it won't do them any harm for a short period of outside time.

Hello there!
Disclaimer: I'm also very new to ball pythons, so please keep that in mind. I'd like to share what I got for my 4x2x2 enclosure (which seems to be smaller than yours?)
I got:
- Arcadia DHP (50w)
- 12" Shadedweller Pro Kit (7%)
- Arcadia Halogen (85w)
- Arcadia Lampguard pro (because I will be fastening these to the top of my enclosure - it is not a mesh top).
- Cages also for my DHP and Halogen

My plan:
Halogen & UVB during day.
DHP at night.

Hope this helps you some. :)

Oh...thermostat - I went with the Herpstat 2.

I have a heating pad at 95 for hot side and a ceramic heat emitter keeping the cold side at 80

Heat mats aren't great for bringing up ambient temps, overheat heating would be much better. Try a ceramic heat emitter (with a thermostat of course) set to 88 on the warm side.

Also 95 for a surface temp is too warm, and you risk burns if your snake burrows at all

Best heating - Arcadia Halogen

Best UVB - Arcadia Forest 6% 24"

Best substrate - Bio Dude Terra Firma

Best thermostat - Herpstat Spyderweb

Best plants - pothos, bromeliad, snake plant, spider plant, dracaena

Let plants establish and root for a month before adding the snake so they are sturdier.

For humidity, ensure at least 4 inches of substrate, pour water in corners to moisten bottom layers.

https://imgur.com/a/3SQWhXo

I attached photos of how you can mount heating. You will get the sockets for the bulbs from the same website as the bulbs and the brackets will come with the socket. Then cages to keep snake safe. You just use screws that are smaller than the thickness of your PVC. Design and attach to top of enclosure before building, remember when you are designing that you will have to flip the board over later on. Make sure the aligning side piece of pvc has a notch or two in it for all wires to run out of the enclosure. You’ll want to use cable clips to attached the pvc so that the wires don’t leave any room for snake to get tangled in. I have 3 bulbs there, the two circular ones are halogen and DHP. You will want two heat sources as the halogen is a light, so it’s not good for nighttime. The DHP doesn’t produce light. You will definitely want a herpstat 2 for these bulbs. You can get cheap organic top soil and play sand for substrate, doesn’t have to be fancy substrate

Hi! I totally get that setup is difficult and confusing, so no worries!

What you have so far is great! I have the same DHP.

The setup you have is a very common one. You don’t necessarily have to have a halogen, it’s just another option to consider. Many people only have a lightless heat source and a UVB, so what you have right now is great!

Temps should be 88-92F on the warm side and 77-80 on the cold end. It’s difficult to maintain a heat gradient in a 40 gal, but it’s not impossible.

Another thing I’d like to mention is the difference in hides (of which I’m not sure you know about), but you want to be sure you have one on each side that is identical to the other, and lots of clutter and some optional other hides :)

A 40 gallon is fine for a younger/smaller snake, but eventually they'll need at least a 4x2x2 (rule of thumb is that the tank should be long enough for them to fully stretch out if they want to.)

You can add a second heat source, such as a DHP or CHE.

You need a thermostat for your heat source. For now turn it off or raise it above the tank until you get cooler temps.

Depends. Do you have glass, pvc, or a tub? I personally prefer heat mats. I find it ensures your snake is warm enough to digest and not get sick. Lamps are good too, but I find they only work if you snake is a basker

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