Arzel’s zone weighting feature lets you control fan speed based on the amount of ductwork being served. This optimizes multi-stage equipment in two ways: 1) The equipment can stay in a lower stage more often because it's not conditioning the entire home and 2) You can create smaller zones because you can lockout second-stage operation when a small zone is calling by itself. Zone weighting is available with the HeatPumPro and GTPro zoning panels. To learn more, see our Zone Weighting Training Video.