Summer heat in a warehouse is so much more than a comfort problem. It’s a productivity problem, a safety problem, and in some cases a product integrity problem. While OSHA doesn’t set a specific maximum workplace temperature, they do enforce the general duty clause, which requires employers to provide a workplace free from recognized hazards. And excessive heat is considered a recognized hazard.
Here are six approaches that make a real difference.
1. Improve Air Circulation First
Before investing in cooling equipment, make sure you’re getting the most out of air movement. In large warehouse spaces, stagnant air makes the perceived temperature so much worse than the actual temperature. Moving air across your skin accelerates evaporative cooling, which is your cheapest and fastest tool for making a hot warehouse more bearable. That sounds obvious, but it’s worth mentioning.
High-volume, low-speed (HVLS) fans are designed specifically for large open spaces. A single HVLS fan with a 20 to 24-foot diameter can circulate air across a floor area of up to 20,000 square feet. The energy cost to run one is minimal compared to the coverage it provides. Multiple units spaced throughout the facility create consistent air movement that workers feel at floor level, which is where it matters.
Smaller directional fans and floor fans can then supplement HVLS fans in specific work areas. Places like packing stations, shipping desks, and receiving areas all benefit from these types of fans.
It’s worth mentioning that air circulation alone won’t bring the temperature down. But it changes how the temperature feels on the body, which has a direct impact on worker comfort and productivity. In moderate heat conditions, improved circulation can make a big difference – especially when combined with other options that do bring the actual ambient temperature down.
2. Consider Air-Cooled Chillers
For warehouses that need temperature reduction, chiller systems are great. Among the options available, air-cooled industrial chillers offer a combination of performance and practicality that fits a lot of warehouse applications.
Air-cooled chillers work by rejecting heat directly to the outside air through condenser coils and fans that are built into the unit. They don’t require a cooling tower or a condenser water pump, which simplifies the installation and eliminates the infrastructure and ongoing costs associated with water-cooled systems. For facilities that don’t already have a cooling tower and don’t want to build one, this is a big advantage.
Air-cooled chillers work well in a range of warehouse sizes and configurations. They can be positioned outdoors, freeing up interior floor space. Or you can have multiple units deployed in parallel for larger facilities. And because they’re self-contained, adding cooling capacity as your operation grows is relatively straightforward.
The trade-off here is that air-cooled systems are somewhat less energy efficient than water-cooled chillers in extreme heat. This is because their performance depends on the ambient outdoor air temperature. In very hot climates where outdoor temperatures regularly exceed 100 degrees, there’s a pretty wide efficiency gap. For most warehouse applications in moderate to warm climates, the lower installation and maintenance costs offset that efficiency difference over the life of the equipment.
3. Manage Solar Heat Gain
A significant portion of the heat inside a warehouse during summer comes from the sun beating down on the roof and walls. In a large warehouse with tens of thousands of square feet of roof surface, solar heat gain is typically the single largest contributor to interior heat.
Reflective roof coatings are one of the most cost-effective interventions available. A white or reflective elastomeric coating applied to an existing roof can reduce surface temperature by 50 to 60 degrees on a sunny day compared to a dark, uncoated roof. That reduction translates directly to lower interior temperatures and reduced load on any mechanical cooling systems you’re running.
Roof insulation is the longer-term investment, as this reduces heat transfer year-round. At the end of the day, it keeps heat out in the summer and reduces heat loss in winter. If your warehouse was built with minimal insulation, adding insulation during a roof replacement is a must.
4. Use Spot Cooling Strategically
Cooling an entire warehouse to a comfortable temperature is expensive and often unnecessary. In most warehouses, the majority of workers spend their time in specific zones: pick modules, packing areas, receiving docks, and workstations. Cooling those zones rather than the entire building is significantly more cost-effective.
Portable evaporative coolers work well in dry climates and can drop temperatures by 15 to 25 degrees in the immediate area around the unit. They’re mobile, relatively inexpensive, and require only a water supply and standard electrical power.
Make Your Warehouse a Comfortable Place
Keeping a warehouse cool in the summer requires a combination of approaches rather than a single solution. Air movement, mechanical cooling, solar heat reduction, spot cooling, dock management, and worker protection all contribute to a facility that stays productive and safe when outdoor temperatures are working against you.
The operations that handle summer best are the ones that plan for it before the first heat wave arrives, rather than reacting after the building is already an oven.
