I grow in a 4x4x8’ tent using LED lights. I don’t think I have a humidity problem, but, I may depending on where and when you measure.
On top of the canopy (SCROG) where it’s a warm 82°F the RH is 47%, below the canopy in the shade it’s 73°F and the RH is 68%. I have constant 24hr ventilation going and an oscillating fan below the canopy.
One other reading of importance; when the lights go out at night (12/12) during the dark period the tent temp drops to the room temp of 70°F. The RH at both the canopy and below max out at 81% humidity.
In the spring/summer/fall I run a window A/C unit that takes the humidity out of the air. I actually run a humidifier. But right now when the air is cool and humid outside, the A/C unit barely runs.
Yes I can run a dehumidifier, but what RH am I looking for and where do I take the reading from?