I have been using aspen for a couple months now, but yesterday I swithched back to ReptiBark cause Petco was having a special buy one 10qt bag and get a 4qt bag for free. So I bought two. Anyways I noticed last nite after changing the aspen to Reptibark that my temp rose by 5 degrees and my humidty 10. So I tried a little experiment. I took the current readings from another snake cage that still had aspen in it and switched it out with ReptiBark. Same thing happened my temps and humidity rose. Has anyone else noticed this between the two or am I talking crazy?