The most effective way to cool a warehouse without AC is to combine air movement, cooler fresh air and heat removal: HVLS fans across the floor, industrial evaporative coolers where people work, and exhaust fans to pull out hot air under the roof. Roof measures and good layout make each of these work better.
1. HVLS fans for air movement
Large, slow ceiling fans keep a steady breeze across the whole floor and between racks. Workers feel cooler and floors stay dry. One 24 ft fan covers about 11,688 sq ft. See the HVLS size guide.
2. Industrial evaporative coolers for cooler air
Duct coolers bring in fresh outside air cooled through wet pads and duct it to packing, picking and dispatch areas. Each covers 1,000 to 3,000 sq ft on a 1.1 to 4.5 kW motor. Cool where people work rather than the whole volume.
3. Exhaust fans to remove hot air
Hot air collects under the roof. Exhaust fans high on the walls, especially 54 inch drop hammer fans, pull it out and keep fresh air flowing through. They are essential with evaporative coolers so humidity does not build up.
4. Roof and building measures
- Insulate or coat the roof to cut heat coming in from the sun
- Add roof ventilators or ridge vents
- Shade west-facing walls and dock doors
- Keep dock doors open on the shaded side for cross-ventilation
5. Mobile floor fans for hot spots
Loading bays and temporary work areas benefit from a mobile floor fan that can be moved as needed.
6. Layout and air paths
- Place coolers on the side the wind usually comes from
- Run ducts to the work zones, not into empty roof space
- Leave aisles for air to move; avoid blocking fans with stacked goods
- Keep a clear exit path for warm air on the far side
A typical combination
For a 50,000 sq ft warehouse: about five 24 ft HVLS fans across the floor, duct coolers covering packing and dispatch areas, and a row of 54 inch exhaust fans high on the far wall. We size this from your drawing; see warehouse cooling.
Frequently asked questions
What is the cheapest way to cool a warehouse?
HVLS fans and exhaust fans for air movement, plus evaporative coolers where people work. They cost far less to run than AC.
Do evaporative coolers work in warehouses?
Yes, when there is an exit for warm air through open doors or exhaust fans. Duct the cool air to work areas.
How many HVLS fans does a warehouse need?
Roughly one 24 ft fan per 11,688 sq ft, adjusted for racks, lights and roof height.