The placement of air registers a new construction is a complicated process and is done by a professional heating and air conditioning specialist who carefully analyzes the heating and cooling requirements and patterns of airflow. An efficient system of airflow will save the homeowner money and improve the comfort the space provides. A custom home will have input from the homeowner; a home being constructed by builder for resale will handle the air registers approved by the builder.
The home design determines the placement. A home built on a slab will have air registers in the ceilings of the rooms. A two-story home offers more options as well as the home with a basement. The type of heating and cooling system enters into this equation, i.e. air-conditioner, heat pump, furnace or combination. Larger homes and two-story homes can be divided into zones and require more than one heating and cooling source; each one has its own systems of air registers. This allows different areas of the space to be heated or cooled at different temperatures; some of the rooms not used during the day need less heat during the winter and cooling during the summer.
Most professionals prefer to keep the ductwork main lines no longer than 24 feet; moving air further than that reduces the efficiency of the system. Sometimes these vents are placed around the outside walls, sometimes they are located in the ceiling in the middle of the room. Cold air returns must be calculated into this equation; cold air returns provide air to the furnace or air conditioner to be recirculated and assist in keeping the air pressure uniform throughout the space.
Careful consideration into how each room will be used, the amount of people occupying the space, appliances that generate heat, the size and number of windows, the location of the windows and if the south facing windows have shade during the hot summer afternoons are all analyzed. The correct amount of airflow and the location of the air registers will keep these spaces comfortable and uniform in temperature. Otherwise the cantankerous mother-in-law will find the one area that is too cold or too hot and complain unmercifully until the temperature is adjusted to accommodate her making the rest of the home uncomfortable for the family.
Putting air registers in the right location make the home comfortable and the utility bills lower. A heating and air conditioning specialist will work with contractor to find the best locations for these.