There will be occasions when you want to raise the tent’s humidity level. While not everyone who grows does so, you might want to if your air is naturally very dry.
To add humidity, simply place a five-gallon pail filled with water in the room. A small to medium-sized tent will remain sufficiently humid with it. Try using more pails if your tent is big.
MORE: Would It Be Okay to Place a Humidifier inside a Grow Tent?