I like to use make several thermal micro-climates within the enclosures. Such as areas with basking sites with with higher temps (mid 90's) to cooler areas (70's). This allows the animals to thermoregulate adding a level of enrichment to the enclosure as well, not to mention these guys are much better at caring for themselves than we can ever hope to do. If the cage is large enough and there is enough thermal gradients, I will even extend out those max/min levels.