Natural Ventilation vs Fan-and-Pad Cooling
Cooling is where greenhouse ROI is won or lost in warm climates. Roof ventilation and pad-and-fan systems are the two dominant approaches — and they respond very differently to humidity, energy price and crop.
Where does fogging fit into this decision?
Fogging (high-pressure mist) is a complement, not a substitute. It raises humidity and reduces leaf temperature without moving as much air as pad-and-fan. In humid climates it pairs well with natural ventilation; in dry climates it can extend the useful range of pad-and-fan systems.
Natural roof ventilation
Continuous roof and side vents driven by wind and buoyancy, often paired with insect nets and internal shade screens.
Advantages
- Very low energy cost — no fans running through the day
- Simple maintenance, no water treatment for pads
- Works well in dry, breezy and mild climates
Limitations
- Limited cooling capacity — struggles above 32–34 °C ambient
- Depends on wind and structure geometry
- Insect nets reduce airflow and must be sized accordingly
- CAPEX:
- Included in most Venlo and multi-span structures
- OPEX:
- Minimal — maintenance and screen replacement only
- Best for:
- Highland tropics, Mediterranean, temperate Europe, mid-tech projects
Fan-and-pad evaporative cooling
Wet pads on one gable, extract fans on the opposite gable, air pulled across the greenhouse and cooled by evaporation.
Advantages
- Reliable 6–12 °C cooling below ambient in dry climates
- Predictable climate independent of wind
- Compatible with high-value crops in hot arid zones
Limitations
- High fan energy — 15–30 kW per hectare running continuously
- Ineffective in high-humidity coastal climates
- Water treatment and pad maintenance required
- CAPEX:
- €8–20/m² additional CAPEX
- OPEX:
- Dominated by fan electricity and water
- Best for:
- MENA, Sahel, arid inland zones, high-value tomato/pepper/cannabis
Our verdict
In dry inland climates, pad-and-fan is essential above ~32 °C summer peak. In humid coastal climates, natural ventilation plus high thermal screens and fogging usually beats pad-and-fan on both CAPEX and OPEX. In highland tropics, natural ventilation alone is often enough.
Independent guidance from a human-led sourcing platform — we do not resell equipment. Ranges are indicative and shift with project size, geography and financing structure.
FAQ
- Where does fogging fit into this decision?
- Fogging (high-pressure mist) is a complement, not a substitute. It raises humidity and reduces leaf temperature without moving as much air as pad-and-fan. In humid climates it pairs well with natural ventilation; in dry climates it can extend the useful range of pad-and-fan systems.
- How much energy does pad-and-fan really use?
- Rule of thumb: 15–30 kW per hectare of fans running 8–14 hours a day in peak season, plus 0.5–2 m³/ha/day of water. Solar hybridisation (see /solar-greenhouses) can absorb most of that daytime load.
- Are there hybrid designs?
- Yes — most modern high-tech greenhouses combine natural ventilation, thermal/shade screens, fogging, pad-and-fan and (in cold climates) heating and heat storage. The right mix depends on the climate curve at your site, not on a single vendor's product line.
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