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Once you've installed your air conditioners and co2 systems, you'll need humidity control to complete the trifecta of climate control in order to perfectly dial in your grow room.

Most serious growers will need both humidifiers (for propagation & vegetative growth) and dehumidifiers (for the bloom, maturation & ripening phases).  It is essential to maintain precise control over your environment and keep your humidity, temperature & co2 at proper levels in relation to one another.  Once you're able to achieve perfect VPD (Vapor Pressure Deficit) levels, you'll take your grow room to the next level.  Yields will increase and crop cycles will be shortened significantly.  Your plants will be much more naturally resistant to bugs, mites, mold, mildew & stress.  

Inadequate humidity control can lead to a list of grow room problems.  Mold and mildew such as Botrytis, powdery mildew, black mold and bud rot are common issues related to excess humidity in a growroom.  When planting seeds, propagating clones and in the early vegetative phase, plants will require elevated levels of humidity which in some climates may require a humidifier.  Optimal humidity levels are upwards of 90% for propagation so you'll need to choose a humidifier that can