how big is your enclosure? if you have two heat sources, both of which hopefully are regulated by a thermostat, you shouldn't have to worry excessively. yes, your ambient temperatures are a bit on the low side, but if you're working with an aquarium-type set-up, it should be manageable, although perhaps less than ideal.
edit: 72 is too cold for ambient, but if your cold side remains around 75-78, that's actually ideal. where are you taking your readings?
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