Evaporative coolers, more commonly called swamp coolers, pull warm outside air through water-saturated cooling pads, where evaporation drops the air temperature by 15 to 40°F before it reaches the living space. The process uses only a fan, a water reservoir, and pads. No compressors, no refrigerants. The cooling effect is powered entirely by water and airflow, which is a big part of why operating costs are so low.

Evaporative coolers perform best where outdoor relative humidity stays below 50%. The arid Southwest, Mountain West, Southern Plains, and parts of the Pacific Coast are ideal. In those climates, the evaporation process produces real, noticeable cooling. In consistently humid regions, the added moisture makes indoor air feel heavy rather than cool, so effectiveness drops off. Beyond residential whole-home use, swamp coolers are well-suited for garages, warehouses, and commercial spaces in dry climates. Portable evaporative coolers work in semi-open or outdoor settings like patios, job sites, and covered loading docks; virtually anywhere that isn't sealed and saturated with humidity.

Surplus evaporative coolers are usually brand-new and never installed. Surplus equipment enters the market when manufacturers or distributors have overstock, canceled orders, or discontinued model runs; circumstances that have nothing to do with the unit's condition or functionality. Buyers get excellent performance at a significant discount compared to full retail pricing. If you're used to assuming "liquidator" means used or refurbished, that's not how surplus works here. These units have not been put into service.

Evaporative coolers are lower in cost than central air conditioners. However, they require very specific conditions and are not reliable for consistent running all summer. Discount swamp coolers sourced as surplus reduce the upfront cost even further compared to buying through a full-price HVAC distributor.

Sizing is based on CFM (cubic feet per minute) of airflow. A practical starting point: divide the room's square footage by 2 to get the minimum CFM needed for effective cooling. A 500-square-foot room, for example, needs at least 250 CFM. Portable evaporative coolers are sized for single rooms, garages, and spot-cooling situations; whole-house units connect to ductwork and handle larger spaces. Commercial and industrial applications factor in ceiling height alongside square footage, so CFM requirements climb quickly in tall-ceilinged warehouses or shop floors. If the calculation isn't clear-cut for your application, Surplus City's specialists are available by phone to help match unit capacity to your space.

Yes, Surplus City ships surplus evaporative coolers to all states. Freight options include ground, LTL, flatbed, ship-to-terminal, and full truckload for contractors or buyers purchasing multiple units. Shipping specialists can build custom quotes for larger orders. If you prefer to see equipment in person before buying, showroom locations are open in Lebanon, IN; Lafayette, IN; Grand Prairie, TX; Greenville, SC; and Lebanon, PA. Whether online or in person, the inventory is the same brand-new, never-installed surplus stock.

Evaporative coolers need more routine attention than AC condensers, but the work itself is simple. During peak cooling season, check and clean the reservoir, inspect the pump and fan, and replace the cooling pads at least twice per season (more frequently with continuous operation). Most basic units have only two moving mechanical parts (fan motor and water pump), so when something does need repair, parts are inexpensive, and the work is often DIY-friendly. Before cold weather sets in, drain the reservoir and cover or store the unit. That winterization step protects the pads and pump from freeze damage and significantly extends service life.