Air conditioning device and method with vapor pressure deficit control

An air conditioning device with VPD control for indoor residential cannabis cultivation, the air conditioning device with VPD control comprising:

• a power supply;
• a fan driven by a motor, wherein the fan includes a plurality of fan speed gears under a fan mode;
• a cooling unit for providing cold air to the air conditioning device with VPD control for indoor residential cannabis cultivation, wherein the air conditioning device includes a plurality of cooling power gears under a cooling mode;
• a temperature-humidity sensor for sensing an environmental temperature value TENV and an environmental relative humidity value RHENV within an indoor cannabis cultivation environment, wherein a leaf VPD value VPDLEAF is calculated from the environmental temperature value TENV and the environmental relative humidity value RHENV;
• and
• a control module that comprises:
• a display screen,
• an IO interface for input and output of control information and status information;
• a control unit for communicating with and controlling the power supply, the fan, the motor, the cooling unit, the IO interface, and the temperature-humidity sensor, wherein, in a cooling mode of the air conditioning device with VPD control, the leaf VPD value VPDLEAF calculated from the environmental temperature value TENV and the environmental relative humidity value RHENV is implemented to control the air conditioning device with VPD control for indoor residential cannabis cultivation,
• wherein in the cooling mode, when the leaf VPD value VPDLEAF is greater than or equal to a predetermined threshold VPDθ, the cooling power gear is increased to a Max-level cooling power gear set in a ON cooling mode, wherein when the leaf VPD value VPDLEAF is lower than the predetermined threshold VPDθ, the cooling power gear is decreased to a Min-level cooling power gear set in a OFF cooling mode.