Laser manufacturers may supply cooling equipment with their instrument, recommend a chiller manufacturer, or provide the cooling specifications and let the user select a chiller. The price of installing a recirculating chiller represents a very small fraction of the total cost of purchasing and installing a laser. The chiller must be correctly sized, however, as well as adequately equipped, reliable, and delivered on time. A chiller that does not meet these criteria could spell disaster for the laser performance. The first step is to define the basic chiller requirements such as capacity, coolant, and flow rate; the second, to determine which options are needed; and the third, to look at other considerations such as warranty and ISO 9001 certification.