I don’t use any type of chip substrate, so I can’t speak to that part, but I can confirm that the heat does rise and warm the floor of the cage above. I don’t get a lot of transference with my plastic or pvc cages, but it is a little warmer on the cage floor due to the rhp on the cage below. It takes a little tweaking with the stack to get the temperatures where I want them. Each thermostat has a slightly different setting. That said, rarely are all the rhp’s running at the same time because my thermostats are the on/off type rather than proportional.
You could use a sheet of rigid foam between the two cages (1/2” maybe?) to provide a break between the cages.








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