Anden Humidifiers

Anden Steam Humidifiers for Cool, Dry Grow Rooms

Most grow rooms fight excess humidity from plant transpiration. The opposite problem shows up in cool winter rooms, propagation areas, mother rooms running low canopy density, and drying spaces that pull RH too low for proper terpene retention. Anden builds two steam humidifiers and a dedicated controller for those use cases, sized to add measurable grains of moisture to rooms that refrigerant dehumidifiers would otherwise dry out below target setpoint.

When You Actually Need a Humidifier

The four scenarios that justify a humidifier in cultivation:

• Clone and seedling propagation: Cuttings need 70 to 80% RH to root without wilting. Empty propagation rooms with bright LED lighting will fall to 40% RH in a few hours without active humidification.
• Winter rooms in cold climates: Outdoor air at 20 F with 60% RH carries almost no water. Once you heat that air to 75 F, the indoor RH crashes to single digits. Veg and clone rooms in northern climates need humidifiers from November through March.
• Dry rooms during overshoot: Dehumidifiers running on a fixed setpoint can drop a drying room below 55% RH, which dries flower too fast and locks in chlorophyll. A humidifier on the same controller adds moisture back to hit the 60 to 62% RH window where slow cure works best.
• Light-load veg rooms: Veg rooms running below 50% canopy density don't transpire enough to hold target VPD. Adding a humidifier on a setpoint of 65% RH gets you to a 0.8 to 1.0 kPa VPD that veg plants actually like.

AS35FP and AS150: Choosing the Right Capacity

The Anden AS35FP is a medium-capacity steam humidifier rated for rooms up to roughly 2,000 cubic feet. It is the right pick for a 10x10 veg room, a single 4x8 propagation room, or a small dry room. The AS35FP needs the Anden A65 humidifier control to read room RH and modulate output, sold separately because most growers wire the A65 into a central controller rather than mounting it standalone.

The Anden AS150 steps up to high-capacity service for rooms above 2,000 cubic feet, including multi-tent facilities, large dry rooms, and mother rooms running multiple light banks. The AS150 is what you specify when an AS35FP would short-cycle trying to hit setpoint in a larger space.

Pairing With Room Controllers

Both humidifiers run cleanly off the A65 dedicated control or off a 0-10V output from an environmental controller like TrolMaster Hydro-X or AC Infinity Controller 75. The advantage of running off the room controller is single-pane setpoint management: the same controller managing your dehumidifier setpoint, lights, and fans also drives humidification, so the room never fights itself with simultaneous humidification and dehumidification. For an installation where humidifier and dehumidifier are on the same air loop, set a 5% RH deadband between the humidify-up and dehumidify-down thresholds to prevent rapid cycling.

What These Are Not

Anden's AS-series are steam humidifiers, not ultrasonic or wicking units. Steam is the right technology for cultivation because it injects pure water vapor that does not carry minerals, biofilm, or aerosolized contaminants into the canopy zone. The tradeoff is power draw: steam humidifiers run a heating element to boil water, so plan for the electrical load on your circuit during sizing. They are also fixed-install units that connect to a building water supply, not portable plug-and-play boxes.

Related Guides

• Humidity Control for Indoor Grows
• Grow Room Temp and Humidity Chart
• Anden Dehumidifiers: The Complete Grow-Room Buying Guide