Yep, definitely sounds like you need either a thermostat or a rheostat. Until you can get one, try lifting the enclosure off of the ground with plywood strips to allow some additional oxygen flow.
If I may share some advice on t'stats/r'stats, I have used both in the past, and, though r'stats can fluctuate and need to be adjusted, they do give you a ton of control, and generally work pretty well. It is MUCH better to use a r'stat than a crappy [therefore dangerous] t'stat. If you're going with a t'stat, look into spending a decent sum of money on one (I paid $80 for my Johnsons). If you don't feel comfortable buying a t'stat, go with a $10 r'stat at Lowes. As I said before, they aren't a perfect solution, but do make a big difference. I've been using r'stats on a couple of my enclosures for several years and I have yet to come across any problems.
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