Try adding a small fan to your enclosure. This will keep the warm air circulating and you won't have such a big difference from top to bottom. A little 6 or 8" desktop oscillating fan mounted up in a remote corner would do the trick nicely.

I did this with the oil filled in my snake room and it made a huge difference. One other addition that also helped was rigging a plastic shoe box on top of my radiator and keeping this filled with water. It helps maintain the humidity and moist air holds heat better than dry.
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BigT
There is a difference between ignorance and stupidity. The ignorant can be taught, stupidity is beyond our control.
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