A sources-sought notice describes a requirement to replace a computer room air conditioner (CRAC) unit at Grand Forks Air Force Base, ND. The contractor must remove and dispose of the existing legacy unit, dry cooler, and associated pumps, then procure and install two independent 8-ton CRAC units with new dry coolers, redundant pumps, piping, and movable ductwork. The system must maintain specified temperature and humidity levels and operate using a propylene glycol and reverse osmosis water solution. The contractor would also provide operations manuals, training, preventative maintenance, and 24/7 emergency repair services for four years after acceptance. The government seeks separate estimates for purchasing versus renting the units with a four-year maintenance plan, primarily from small businesses under NAICS 238220.