Dehumidifiers and Humidifiers

Humidity swings can make or break your grow cycle. Too dry and plants dried out—too damp and risks of mold, bud rot, or slow growth skyrocket. Our curated collection of humidifiers and dehumidifiers includes compact units perfect for seedlings and tents and powerful, commercial-grade dehumidifiers that remove hundreds of pints per day to control RH in mature grow spaces. 

Explore models with smart controls, built-in humidistat, continuous drainage options. Check out compatible Dehumidifier filters and odor control products and ventilation and ducting to suit your workflow. From portable mini units to overhead LGR systems, easily automate humidity management, so you can lock in ideal Relative Humidity and focus on yield, not mold.

Need help picking the right dehumidifier? Discover the difference between Quest and Anden, two industry-trusted dehumidifiers. 

Dehumidifier sizing: start with water load, not floor area

Measure room volume (length × width × height in feet), then record temperature, relative humidity (RH), ventilation and the water released each day. The examples below organize your comparison; they are not tested coverage claims or a room-size-to-capacity calculator. Listed pints/day are nominal product ratings, not guaranteed removal in your space.

Turn a water-load estimate into an equipment shortlist

One US gallon of water equals 8 US pints. For example, 10 gallons released into the air per day represents 80 pints/day of moisture before ventilation and HVAC effects. Irrigation input is not the same as airborne moisture: account for runoff, retained water and other losses. For drying, use water actually expected to leave the batch, not total harvest weight, and allow for uneven release across the drying period rather than relying only on a daily average.

Published capacity varies with test conditions, temperature, RH, airflow and installation. Several listings use 80°F / 60% RH; do not assume every model uses the same test. Cooler or drier conditions can reduce removal, so request the manufacturer's performance data at your planned setpoint. Compare that output with peak moisture demand and allow design headroom for changing loads. Confirm voltage, drainage, ducting and heat-management requirements before purchase. No room size or nominal rating alone guarantees an RH target.

RH below your target calls for a different tool: Ideal Air GSH75 humidifier adds moisture rather than removing it. Its listed 75 pints/day is humidification output, not dehumidification capacity.