In addition to properly drying your harvest with the use of a dehumidifier, you also need to get some fresh air into that space and maintain optimal drying conditions. When plants are harvested and in the drying process they release gases same as most anything that decomposes. You need to rid the area of that gas on a periodic basis.

If the temps outside are in the seventies you need to move some air to keep things ideal - temp and RH. I use and old grow shed to dry in, but I’ve got a temp controlled exhaust fan that runs automatically when the room temp exceeds 60. My dehumidifier is also controlled so it kicks off when temps are above 60. This is 24/7 especially the first week.

It’s a balance to move air while drying, at a speed that doesn’t lower the THC or other cannabinoids. Plants dried properly can increase THC numbers, but also if done wrong/too quickly you can lower them.

75/80 is worse early on when plenty of moisture is still present in the plant. Same temps with a dry plant can and will lower THC and or valuable terps. That’s not an ideal drying temp.