In the summer, it is currently set for 74 day and night. In the winter it is usually about 68-70 in the day and a few degrees cooler at night.(these temps can be remedied somewhat, however, if needbe, via a wonderful invention called a thermostat. [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img] ) Also, if I keep the door closed, the room I have my plants in tends to be a few degrees warmer in the summer and a few degrees cooler in the winter(most likely because the room has 3 outside walls) than the hall where the thermostat is. That may help with temperature regulation some. So yes, the temperature does fluctuate some.