I don't really know what the cages look like, but some things to consider:



1) Where are the cages located? Does hot or cold air blow on them at various times of the day? Say an open window or heater vent.



2) Is your heat source putting out consistant heat? Do you have any power fluctuations in your system? Do you have any timers that maybe activating or deactivating when you don't expect it?



3) Humidity and temperature can be tricky to measure. There is a lot of thermodynamics that go into it. Your fluctuations can be a combination of cooling/heating effects coupled with evaporation/condensation effects. Misting can bring temperatures down. Heating can reduce the 'relative' humidity. Cool sides can cause condensation, which will cause temperatures to rise slightly. And then, as the condesation evaporates, temperatures can fall again.



If your other cage is doing fine. I think the base of your problem is to figure out what is different about your custom cages. (Location? contruction? Shape? Ventilation?)



Good luck.

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