HVAC devices are a type of mechanical system used to control the temperature, humidity, and air quality of a given space. These systems are typically used in residential and commercial buildings, and are designed to maintain a comfortable environment for occupants. HVAC systems typically consist of a combination of heating, ventilation, and air conditioning components. Heating components are used to warm the air in a space, while ventilation components are used to circulate the air and remove stale air. Air conditioning components are used to cool the air and remove excess humidity. All of these components work together to provide a comfortable environment for occupants. HVAC systems are also designed to be energy efficient, helping to reduce energy costs and reduce the environmental impact of a building.