Willhi Humidistat Humidity Controller – Automated Climate Control for Your Grow Environment 120V/240V

Precise & Reliable Humidity Control for DIY Humidifiers

💨 Free Shipping on All Orders – Fast & Secure Delivery!

Take the guesswork out of maintaining perfect humidity with the Willhi Humidistat Controller from The House of Hydro. Designed to automatically control your mist maker and waterproof fan, this controller keeps your environment within your desired humidity range—turning devices on when humidity drops and off when it reaches your set upper limit.

High amperage rating is perfect for use with single or multiple mist makers, the Willhi humidistat seamlessly manages your indoor air moisture for optimal plant health, mushroom cultivation, terrariums, grow tents, and more.

✅ Why Choose the Willhi Humidistat?

✔ Automatic Humidity Regulation – Maintains your preset humidity range effortlessly
✔ Runs Multiple Mist Makers & Fans – Supports both small and larger mist maker units
✔ Easy to Use – Simple controls with clear dual LED displays
✔ Accurate & Responsive – Measures humidity between 1% and 99% RH with 1% accuracy
✔ Sensor has a 2-Year Warranty! – Easily replaceable sensor ensures years of reliable service
✔ Compact & Durable – Built to last with a 1-year warranty on the humdistat, 2-year warranty on the sensor
✔ Data Retention – Settings saved even after power loss

📦 What’s Included

• 1x Willhi Humidistat Controller

• 1x 3m (9.8ft) Humidity Sensor Cable

• Free U.S. Shipping on all orders

📊 Specifications

• Humidity Measuring Range: 1% – 100% RH

• Humidity Control Range: 1% – 99% RH

• Control Resolution: 1%

• Humidity Measuring Accuracy: ±1%

• Flexible Power Supply: AC 120V or 240V

• Power Consumption: < 3W

• Relay Contact Capacity: 10A/240V, 10A/110V

• Dimensions: Approx. 125mm x 91mm x 40mm (4.92" x 3.58" x 1.57")

💡 Pro Tips & Usage

• For best results, create a “J” hook with a rubber band or zip tie on the probe cable to keep the sensor pointing upwards, preventing condensation buildup on the sensor.

• Use a heavy-duty GFI power strip to connect multiple foggers and fans for smooth operation at higher humidity loads.

• Ideal for mushroom farms, greenhouses, grow rooms, reptile enclosures, and any space needing consistent humidity control.

🌱 Integrate Into Your Humidification System

Pair your Willhi Humidistat with any of The House of Hydro Mist Makers and accessories for a fully automated, professional-grade humidification setup. Check out our DIY Humidifier Build Guide for full system ideas.

⚠ Shipping Notes:

• ✅ Free Shipping within the USA on all products.

• 🌍 International customers: shipments outside the USA may incur customs fees. These costs vary by country and are not included in your purchase price.