The Autopilot Dehumidifying Humidistat is a compact and easy-to-use controller for dehumidifiers and exhaust fans. Simply plug it into a power receptacle and then plug your dehumidifying device into its outlet, then choose your preferred relative humidity (RH) setpoint with the rotary knob. When its built-in sensor senses that the RH has exceeded the setpoint by at least 1%, it will automatically activate your dehumidifying device by powering the outlet. Its green LED light illuminates when the outlet is activated to on. When the RH in the room has dropped at least 1%, the Autopilot Dehumidifying Humidistat will cut power to the dehumidifying device. Digital screen displays current in room relative humidity. It has a built-in 1% RH dead band and is ETL-listed. Max power handling 15A.

• Easy to use analog control
• Reduces humidity to desired level
• Controls dehumidifier or exhaust fan
• Humidity control range: 30 – 90°F

Specifications

5.5″H x 2.75″W x 1.75″D, 110-120VAC 60Hz, 15(3)A

Your plants need a very specific moisture content to thrive, and its not always easy to keep this metric in the ideal range.

We’ll cover how to raise and lower humidity in your grow tent. But first, we want to quickly talk about the growing environment, and why ideal humidity is so important.

Why Does Humidity Control Matter?

If you don’t control humidity in your grow tent, your plants will suffer. Both ends of the spectrum can cause problems.

If humidity is too high, your plants are much more susceptible to mold and mildew issues. These can quickly spread in a grow tent, and ruin an entire crop.

Excess humidity also will mess with nutrient uptake. This is because the stomata in your plant’s foliage will sense that there is plenty of moisture in the air, and it will stop taking up moisture through the roots.

Since this is where you apply your nutrients, nutrient uptake will cease as well. This leads to a stall or lag in plant growth, and can lead to deficiencies.

Not enough moisture on the other hand, and your plants will dry out and become more prone to heat stress. So, on either end of the spectrum, you’ll run into issues and your plants won’t be able to thrive.

This is why controlling humidity in grow tent is so important. We’ll cover how you can do this in a bit, but first, let’s cover the optimal humidity range across different stages of plant growth.

What Is The Ideal Humidity Range?

In general, plants prefer a slightly humid environment. This range changes across the plants different stages of life, however.

Plants like higher moisture levels during seedling and early veg, and this range will taper off to the lower end over its life. Here are some guidelines for grow tent humidity across the different phases:

• Seedling/early veg: 70-75%
• Veg: 50-70%
• Flower: 40-50%