HVAC, or heating, ventilation, and air conditioning, is an essential part of any home or building. HVAC systems regulate indoor temperature and humidity using the principles of thermodynamics and fluid mechanics. These systems are also used in vehicles and marine environments. A central HVAC system is responsible for keeping a home or building comfortable during hot and cold weather.

Heat pumps and furnaces are two major components of a home HVAC system. Some homes have a combination of both, while others use a separate heating and cooling system. Heating and cooling systems are connected by ducts and often use a dual fuel system. While most HVAC systems use a combination of both, a split system is most common for homes with extra space.

HVAC systems can also use a high-voltage alternating current (HVAC). The outdoor unit is located outside the house, and has a fan. HVAC technicians also check the outdoor unit’s fan, tighten electrical connections, and check the moving parts to ensure they’re working efficiently. They may also check for leaks in refrigerant.

HVAC professionals should have a strong understanding of HVAC standards. The ASHRAE Handbook, which is updated every four years, is a good resource. This manual contains detailed calculations for heating and cooling and provides standards of design. It also includes information on the installation requirements of HVAC systems.