What are the features to consider in the selection, design, and installation of a heating, ventilating, and air-conditioning (HVAC) system? 

Key factors include:

• Performance, efficiency, and the initial and life costs of the system
• Fuel, power, air, and water required
• System flexibility to service different zones of the house
• Space requirements for the mechanical equipment and distribution system
• Access required for service and maintenance
• Degree of visibility, whether concealed within the construction or exposed to view

Dr. Ronn Phillips, Arch.D., and Bobbi Hauptmann
Environmental Design, College of Human Environmental Sciences, University of Missouri-Columbia