I’m having the same problem, but @InTheShed recomended a bowl of water n towel with the fan blowing over n it raised it up to 50 rh. Good luck n happy growing. CLDay 24
Roughly a day from turning on the humidifier, a full gallon of water !
Tried lots of combinations, with my room exhaust fan off I can get the humidity up to ~50% but the temp is 90F !
I decided to settle for less rh and a lower temp, exhaust fan on temp is 85F but humidity drops to mid 30's.
Oil filled heater keeps the temps in the low 70's at lights off. Also humidifier and exhaust fan are off.
These pictures are from yesterday.....
And this picture was about an hour ago...
Cheers