WILL 3 FAN's DROP THE HUMIDITY?

If I put 3-4 fans in my grow room, will my humidity go down?

nope. fans dont do anything for humidity, they just blow air around. if you have the money get a dehumidifier

OK....good information. Do dehumidifiers eat up electricity?

Fans can drop the RH a bit *IF* they are pushing new air in and old air out of the room. Really depends on the RH of the room and the RH outside the room as to how much it will drop.

Dehumidifiers are basically AC units. Refrigerant, compressor, condensing coil, evap coil. Temps will go up with a dehumidifier. Might be better off getting an AC unit and kill 2 birds with one stone.