An IR temp gun is a much more useful tool than a static thermometer (although having a simple digital thermometer in the enclosure can be useful for a quick check each morning, so long as one remembers that if the temp looks off the first thing to do is confirm the reading with the IR gun). They're also cheaper than a couple thermometers, can be used on every enclosure in the collection and last decades.
That said, it may be helpful to post photos of the enclosure, and also note room temps. If you've got a freestanding plastic tub (Xmas tree box?) in a cool room temps are going to be a function of room temp as much as anything, and be a perpetual headache. If you need to run the warm end at 90F to get the ambient up to only 75F, that's not going to be a great situation.
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