I see pretty consistent surface temps of 77-78 on cool side and heated side is steady at 87-89 most likely because I use an on/off thermostate and not a pulse type. It’s set to come on at 1 degree of temp drop from set temp. I see no variance from thermo setting and inside surface of glass, it’s set at 88. My CHE for ambient temps is at 80 it goes up to about 83 and cool side sees 76-77. Athena seems to thrive best in these conditions.