Screw compressor chillers are also now available in smaller sizes than they were in the past. Nobody likes to maintain a cooling tower, but you may be surprised by how much energy you can save by having a small cooling tower dedicated to a water-cooled chiller. Selecting the right materials is critical. An easy upgrade now may allow you to avoid a lot of maintenance problems later. Be sure that the heat exchangers are built in the best materials for your application.
Accessories cost extra.
Even such accessories as efficiency enhancement options. The type of application. How many hours per year the chiller will be in operation. Your in-house maintenance capabilities. Well, as a practical matter, you may be limited to one or two chillers, and they'll need to last for a long time.