There have been many changes in building system design in recent years. Contractors who want to compete have to be aware of new trends.
The system often chosen by many architects and engineers in new offices and buildings is a variable air volume system (VAV) with re-heat capabilities. As the name suggests, a VAV system varies the amount of air delivered to maintain space conditions. A VAV system has the lowest energy costs to operate and, when combined with a building automation system, offers excellent temperature control to the spaces being conditioned. These benefits far outweigh the drawbacks of increased installation costs and system complexity, many engineers say.