The KV-Designer is a software tool for the design of multi-function high-performance run around coil system. It supports the bundling of air flows from various applications, whereby the numbers of air inlet and outlets do not need to be identical, which demonstrates the capability of the software. In addition, there are many ways in which the calculations can performed, be it on the basis of the size and number of the heat exchangers, specific performance targets or the envisaged efficiency. The KV-Designer takes into account predefined air and mass flows that might vary between summer and winter, and considers the various country-specific standards as well as statutory regulations.