It can heat the ceiling a little, especially if the cage height is low, like 12 inches. But the amount of heat is not predicatble or guaranteed to stay a certain temp.

The warmer the room, the warmer likely the heat above the RHP will be. Through 3/4 inch thick wood, it will not be tremendous, but you may feel it warmer to the touch than the surrounding area.

Leave a 1/2 inch gap between cages and it will not even matter.
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Mark

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