Could be that the lower enclosure is having a hard time reaching temps (being on the floor and thus cooler) and the effort the RHP is making to reach the set temp is causing excess heat to rise into the upper cage. It takes me a little while to dial in temps in new cages so I tweak everything for a few days before putting animals in. I haven’t noticed excessive upward heat transfer with my VE RHPs but my Pro-Heat panels do kick a decent bit of warmth to the cage above.
As for the clicking, that’s the relay cutting off/opening up power to the heat source. I know of other folks that have had noisy ones as well. I personally only have the hi-power thermostat from VE for my room heater and it makes a clicking noise, but not too loud and not too often as it doesn’t have to work very hard in the summer. Don’t know if there’s a solution to that, but it may be worth contacting RBI.
Hope this is helpful.
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