There actually are a couple wooden dowels stretched across the length of it. Checked the temps specifically on those and there's a mere couple degree difference and they're only a foot below the RHP. Comparatively the RHPs in my 15" tall PVCs with my two other snakes are able to comfortably heat to mid 80's to 90. Unless this is a case where because there's just more open air the heat dissipates much faster?
Took some pics as well.
I'm planning on making some modifications anyway, like adding shelves midway up the enclosure so maybe that would help? And perhaps with furnishings and humidity the heat will hold much better too instead of a completely bare setting.