well i always use a thermostate to control the temp....it kinda depends on the size of cage....if you set the thermostate to stay at about 87-89 degrees for the warm side(set the probe near the direct beam of heat but not right under it...this will allow a slight increase right in the true "hot spot" but keep temps regulated) with a undercage heating device ...it should keep the cool side around 80-82...once again it depends on how ur cage is set up and how large but thats what works for me...just remember to keep the water source near the warm side so it allows the humidity level to rise...hope this helps

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