Vapor Pressure Deficit (VPD) is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. VPD can help an indoor grower identify healthy air moisture conditions over the full range of growing temperatures. Vapor pressure deficit correlates directly to plant transpiration rates. Using VPD to fine tune water flow through plants gives the grower another “control knob” in the quest to balance the plant environment to create a perfect day year round.

Learn more about Vapor Pressure Deficit (VPD) and how it works in relation to our GrowAire dehumidification systems in our Blog: GrowAire™ VPDsync™ Masters 4 Elements of CEA Control and our video "Desert Aire GrowAire VPDsync Environmental Control".