An HVAC system is a vital part of any home or office. It controls the temperature and humidity of the environment by moving air through a system of ducts. It can be found in residential homes, small industrial buildings, and large office buildings. It is also used in vehicles and marine environments. These systems can be either ducted or ductless. During the summer and winter, HVAC systems can use solar heat and winter's cold to keep a building comfortable and cool. The process of cooling and heating a home is a complicated one. The first step is to open the dampers and let fresh outside air enter. This process is called economizer mode. This mode helps you save energy by using the outside air that is cooler than the indoor air. This way, you don't have to spend energy on mechanical cooling. The design and installation of HVAC systems require a lot of expertise. A good HVAC engineer can calculate the capacity of a building and design a system to meet it. They must also select the refrigerant and other components needed to meet the demands of the building. There are several specialty mechanical contractors and suppliers who work in this area. In addition, building permits and code-compliance inspections are generally required. A HVAC system is an important part of a building's comfort. Not only does it keep the interior air cool, but it also regulates the temperature and humidity. It's one of the most efficient ways to heat and cool a large space.