In residential applications, a good number of "cold room, hot room" complaints are caused by the performance limitations of single-zone conditioning systems. No matter how carefully this type of system is designed and installed, space-temperature excursions with two or more rooms are subject to an incompatible set of load conditions. These conflicting load patterns may be caused by the architecture, the position of the sun (time of day), or the type of load (heating or cooling).
The information in this section can be used to decide if a single-zone system is an appropriate choice for a particular home. And, if a multizone system is required, this information can be used to identify the rooms that have similar load characteristics (so they can be grouped into zones).