Consulting-Specifying Engineer, Sept. 2016, by James M. Del Monaco.
https://www.csemag.com/industry-news/codes-and-standards-updates/single-article/know-when-where-to-specify-vrf-systems/afe0f6f206f06f553b360c1b00bb694b.html

"Variable refrigerant flow (VRF) offers an alternate HVAC solution. Its key attributes include zonal control, energy efficiency, and indoor air quality (IAQ). To help facilitate their successful design and operation, engineers should take advantage of the available resources and training offered by manufacturers, utilities, and others."