– Room Wide: This type of system offers a cost-effective solution for low and medium density data centers. It typically utilizes a false floor to distribute cool air throughout the room. It can be either direct expansion (DX) or chilled water (CW) based, with optional humidity control. Room wide systems can be situated outside the data center if space is an issue.

– In Row: This type of system closely couples the cooling to the heat load, making it more efficient and predictable than room wide systems. It also allows for “pay as you grow” incremental investment strategies. In row systems can be either DX or CW based, and are ideal for medium to high density data centers.

– Rack Based: This type of system provides cooling directly to the rack level, eliminating the need for a false floor or ductwork. It can be either DX or CW based, and can handle very high density data centers. Rack based systems offer the highest level of flexibility and scalability.