In the News: Hortidaily Features DryGair’s “Closed Greenhouse” Strategy for Energy Savings & Disease Prevention

We are proud to announce that Hortidaily has just featured an in-depth analysis by our agronomist, Amir Kandlik.

The article, titled “A ‘Closed Greenhouse’ Approach to Energy Savings and Disease Prevention,” challenges the traditional methods of humidity control and proposes a thermodynamic shift that is already saving growers up to 50% on energy costs.

The Problem: Why Venting is Costing You Money

For decades, the standard response to nighttime humidity has been to open the vents or use the “pipe and vent” method. However, as the article explains, this creates a “thermodynamic conflict”. By exhausting humid air, growers also exhaust valuable heat and CO₂, replacing it with cold, unstable outside air that requires immediate, expensive reheating.

As Amir notes in the piece:
“Nighttime humidity is not a problem that needs to be vented away but an imbalance that must be managed.

DryGair Energy Cycle showing latent heat recovery and closed greenhouse humidity control

The Solution: The Closed Greenhouse

The feature details the “Closed Greenhouse” paradigm. By keeping thermal screens and vents closed at night and using active internal dehumidification, growers can:

  1. Prevent Disease: Keep surfaces above the dew point to stop condensation.
  2. Save Energy: Recycle latent heat from humidity back into the crop instead of losing it to the outdoors.
  3. Improve Climate: Maintain a uniform climate free of microclimates.

Proven Results from the Field

The Hortidaily article highlights several success stories where this methodology was put to the test. You can read more about these specific results in our case studies:

  • Vegetables: Growers reported ~50% energy savings while maintaining optimal climate conditions. 👉 [Link]
  • Flowers: Trials showed a 98% reduction in Botrytis by keeping relative humidity below 85%. 👉 [Link]
  • Basil & Herbs: Documented a 15% yield increase with zero mildew. 👉  [Link]
  • Cannabis: Growers achieved 30–40% higher yields alongside massive energy cost reductions. 👉  [Link]

Read the Full Article

To understand the full thermodynamics behind the “Closed Greenhouse” approach and see how you can turn humidity from a waste product into an energy resource, read the full feature on Hortidaily.

Key Takeaways & FAQ

According to Amir Kandlik, agronomist at DryGair, the “Closed Greenhouse” strategy is a method where nighttime ventilation is replaced by active internal dehumidification. By keeping the greenhouse sealed (vents and screens closed), growers prevent heat loss and treat humidity as an energy resource rather than waste.

Field results from vegetable growers indicate energy savings of approximately 50%. This is achieved because the latent heat released during the dehumidification process is recycled to warm the air, rather than being expelled outside.
Yes. By maintaining a stable vapor pressure deficit (VPD) and preventing dew formation, the risk of disease drops significantly. Flower trials using this method recorded a 98% reduction in Botrytis when relative humidity was kept below 85%.

By maintaining a uniform climate and promoting active transpiration, yield improvements have been documented across various crops:

  • Tomatoes: Up to 25% higher yield per stem in unheated houses.
  • Basil: 15% yield increase with zero mildew.
  • Cannabis: 30–40% higher yield.