Epson and GMG media Temperature and Humidity Recommendations

GMG media is best stored at 73 degrees and 50% relative humidity.
Epson recommends the printer be 40-60% humidity with a temperature between 59-77. Consistency is key. You of course would want to keep it stable and not have the printer be at 60 degrees in the morning and then 77 in the afternoon. A constant 50% and 70 degrees would be ideal.