Well, this depends on a lot of different factors. Where you live, where the cage is going to be in the house, the true ambient room temps that the cage is in. You have to consider the type of cage, wood, plastic.
Then there is the cage heat source, RHP, UTH or heat tape. In a plastic cage humidity is a pretty easy fix with misting, but the taller cages go through it faster.
My radiant heat panel cages are stacked which helps, and I also run a water heater (room heater) to keep the snake room at 71-74 degrees.
If you use a heat panel, you can get the manufacturer of the said panel to usually tell you what size you'll need based on the cage size.
I've been lucky as the cages I buy are built by a really great guy that is very customer oriented and he's directed me through the process, and I have had success with my 3 setups.
I've also been walked through a glass tank setup a ways back from some nice folks here. Aaron "Serpent Merchant" was very helpful when I bought my son his royal (our first snake).
You will get several opinions and ideas here, and probably most of them will work, and work well.
Just find the easiest, most effective way for your situation and you'll succeed.
I really like the way you are going about this process, and I'm confident you'll wind up with a really nice snake and caging setup.
And yes, as mentioned in my previous post and the last one here by Josh, you'll want floor space first, and then go up from there.
They WILL use the space upstairs though and it's fun to watch.
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