If your Indoor Grow Room or Garden is at too high of a relative humidity, use a dehumidifier hooked up to a humidity controller to keep your relative humidity in check. For the vegetative phase, keep relative humidity between 50% and 60%. For the flowering phase, keep relative humidity between 40% and 50%. We offer many different sizes of dehumidifiers from closet and hobby size units, to commercial and industrial size units. In general, dehumidifiers are rated in how many pints or liters of moisture they can remove from the air per day. If the temperature goes up above 90 degrees Fahrenheit, dehumidifiers tend to not work as effectively. Most dehumidifiers have a water collection reservoir and drain hose to remove the condensed moisture from your area via tubing.