When it comes to controlling temperature and humidity in a polyhouse (greenhouse), mist cooling systems can be a game-changer. But not all systems are created equal.
Here’s a detailed, side-by-side comparison of high-pressure and low-pressure misting systems—so you can choose the right solution for your crops, climate, and budget.
Operating Pressure Levels
| Type | Pressure Range |
| High Pressure | 700 to 1000 psi |
| Low Pressure | 60 to 100 psi |
Droplet Size, Evaporation & Humidity Control
| Feature | High Pressure | Low Pressure |
| Droplet Size | Ultra-fine (5–15 microns) | Larger (50–100 microns) |
| Evaporation | Instant – no wetting | Slower – may cause leaf wetting |
| Humidity Control | Precise | Moderate, less controllable |
Cooling Performance
| Feature | High Pressure | Low Pressure |
| Cooling Capacity | Reduces 8–12°C effectively | Reduces 3–5°C |
| Best Suited For | Hot & dry climates | Moderate climates |
Cost, Maintenance & Energy Use
| Feature | High Pressure | Low Pressure |
| Initial Investment | Higher (pump, nozzles, filters) | Budget-friendly |
| Maintenance Needs | Regular (filters, nozzles, pumps) | Minimal |
| Energy Consumption | High (powerful pump required) | Low |
Application Suitability in Polyhouse Farming
| Parameter | High Pressure | Low Pressure |
| Leaf Wetting Risk | Very Low | High (risk of disease) |
| Humidity Sensitivity Crops | Ideal (e.g., lettuce, herbs) | Not recommended |
| Cost-sensitive projects | Not ideal | Better option |
| Precision Agriculture | Best choice | Limited use |
Want Help Designing Your Polyhouse Mist System?
We can help you build a custom misting setup based on:
- Your polyhouse dimensions
- Crop types and climate
- Available water and power supply
FAQs
Q: Can mist cooling systems be automated?
Yes! Both systems can be connected to timers or humidity sensors for efficient, hands-free operation.
Q: What crops benefit most from mist cooling?
Leafy greens, lettuce, spinach, basil, coriander, and indoor herbs respond best to controlled humidity systems.
Q: Can I retrofit my existing polyhouse with misting?
Absolutely. We can help with retrofit kits and installation guides.