if you put a small blanket over the enclosure it will reduce the ventilation..I would not worry unless at night it get below about 14/16c..some T's are quite resilient and hardy. during the winter when i 1st got Charlie it went down to 10c at night and rose onnly to about 18/19 during the day, i did not sue a heat mat, and wont for my other, they just become less active and concerve energy etc
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