I don't have AP enclosures, but any good PVC enclosure will typically have holes or notches where you can thread your temperature probes or any cords for heating/lighting elements. I haven't honestly had any difficulty setting up a temperature gradient in my 4x2x2 with an RHP. I'd order an RHP from Pro Products and talk directly with Bob, the owner there, about any concerns around adequately heating the floor area.
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