If you can't get a thermostat, then you should just get a heat lamp. An infrared heat bulb is much safer. The only issue with them is they reduce the humidity in the cage.
Unregulated heat mats can get hot enough to kill a BP and in rare cases start a fire.
I'm not sure if these are scalable to you but I have had good luck whith these bulbs:
http://www.petsmart.com/product/inde...uctId=11147193
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