Zoning enhances the performance of your system with customized comfort control. Depending upon how many stories, how many windows, which direction the house faces, ect. You may need to vary the cooling or heating in certain areas of your home. With most systems, if one room needs heat, all rooms get heat, whether they need it or not. Think of zoning as turning on the lights only in the rooms that you need light. That’s efficiency. Heating and cooling efficiency is raised by sending treated air only where it is needed. You only pay for what you need.