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Evaporative Cooling vs Air Conditioning: What Works Best for Warehouses?
For most UK warehouses, evaporative cooling provides the best balance of comfort, cost savings and sustainability. It works with open doors, lowers energy use and keeps large spaces comfortable. Air conditioning is still valuable where strict climate control is required, but in open warehouse conditions it often struggles.
Quick answer
Evaporative cooling is usually better for warehouses than air conditioning because it uses up to 80% less energy, delivers a steady supply of fresh air, and continues to perform even when roller doors are open. Air conditioning is best reserved for enclosed rooms needing close temperature and humidity control.
How evaporative cooling works in warehouses
Evaporative cooling uses the natural process of water evaporation. Warm air is pulled through wetted pads, cooled, and then distributed by fans across the warehouse. Unlike air conditioning, which recirculates air and relies on refrigerants, evaporative systems supply 100% fresh air. This improves indoor air quality while reducing heat and dust.
Inergy’s evaporative cooling systems are designed specifically for commercial and industrial sites. They deliver consistent performance, even in open-plan areas with constant activity.
Where air conditioning fits best
Air conditioning works well in smaller, sealed rooms that require tight control over temperature and humidity. Examples include IT suites, packaging rooms, or pharmaceutical stores. In these areas, the system can run efficiently because the air volume is contained. Once applied to large, open warehouses, however, energy losses escalate.
Direct comparison in warehouse conditions
| Factor | Evaporative cooling | Air conditioning |
|---|---|---|
| Energy use | Up to 80% lower electricity demand | High, especially in open spaces |
| Air quality | 100% fresh air, dilutes dust and fumes | Mostly recirculates air |
| Performance with open doors | Remains effective | Efficiency drops significantly |
| Humidity | Adds a small amount, often beneficial | Reduces humidity, useful for sensitive stock |
| Coverage | Broad, even distribution across large areas | Localised cooling, weaker at height |
| Maintenance | Seasonal checks, simple servicing | More complex, refrigerants and coils |
Cost and sustainability advantages
Warehouses cooled with evaporative systems typically run at a fraction of the cost of air conditioning. Over a summer season, this difference can equate to thousands of pounds in saved energy bills.
The environmental impact is also important. Evaporative cooling avoids refrigerants, reduces carbon emissions, and aligns with corporate net zero goals. For more on how cooling can support your green targets, see our guidance on sustainable cooling technologies.
Practical application in warehouses
In practice, the best results often come from zoning. Evaporative cooling is applied in active areas like packing benches and dispatch zones, while natural ventilation supports less critical areas. Our experience designing systems for workshops and warehouses shows that a tailored approach keeps staff comfortable while controlling costs.
Businesses also have a wide choice of products. From Breezair to EcoCooling and Colt Group, each has strengths depending on space and budget. Our commercial evaporative cooling systems review compares the leading brands available in the UK, giving decision-makers a clear view of the options.
Real example of evaporative cooling
We recently delivered a Breezair evaporative system for a distribution warehouse. The solution provided even cooling across the floor area, cut running costs by more than half compared to an AC alternative, and improved employee comfort during peak summer. The full details are in our Breezair case study.
Frequently asked questions
How much cooler can I expect?
In UK conditions, evaporative systems usually deliver supply air 6–12°C lower than outside.
Will humidity affect stored products?
Most stock is unaffected. Paper, electronics or other sensitive goods may need AC for specific zones.
Can evaporative cooling work with roller shutters open?
Yes. Open doors act as exhaust paths and do not reduce performance.
Which system is cheaper to maintain?
Evaporative systems have simple seasonal checks. AC requires more complex servicing including refrigerants, coils and controls.
Next steps
Every warehouse has unique requirements. The right choice depends on layout, products stored and operational budget. Inergy is independent and offers free consultations to ensure you get the system that genuinely fits your needs. Call 01204 929999 or email info@inergygroup.co.uk to book a site survey.
