10 Best Small-Cap Data Center Cooling Stocks to Buy

7. AirJoule Technologies Corporation (NASDAQ:AIRJ)

Number of Hedge Funds: 18

AirJoule Technologies Corporation (NASDAQ:AIRJ) is one of the best small-cap data center cooling stocks to Buy. On May 28, AirJoule Technologies announced a $15.0 million registered direct offering of common stock, with net proceeds intended to support commercialization of its AirJoule Core and AirJoule Prime systems. The company said the raise, combined with existing cash, is expected to fund operations into 2028, which is important because AirJoule remains an early-stage commercialization story rather than an established equipment supplier. Its data-center relevance comes from using low-grade waste heat from air-cooled and liquid-cooled facilities to produce distilled water from air. AirJoule says that water can support evaporative cooling, closed-loop system losses, onsite operations, and broader water-efficiency needs.

The company also says its system releases dehumidified air and can reduce thermal cooling demand before residual heat reaches rooftop chillers. That gives the stock a direct but speculative angle on the cooling and water constraints around high-density AI data centers.

AirJoule Technologies Corporation (NASDAQ:AIRJ) develops atmospheric water harvesting and sorption-based systems through partnerships including GE Vernova and Carrier Global Corporation.