HVAC stands for Heating, Ventilation, and Air Conditioning. It refers to the technology used to provide indoor comfort and maintain acceptable indoor air quality. HVAC systems are commonly used in residential, commercial, and industrial buildings to control temperature, humidity, and air quality.

Heating systems are used to provide warmth in cold weather, while air conditioning systems are used to cool indoor spaces during hot weather. Ventilation systems are used to provide fresh air and remove stale air, moisture, and pollutants from indoor spaces.

HVAC systems typically include components such as boilers or furnaces, air conditioners, heat pumps, fans, ductwork, filters, thermostats, and sensors. These components work together to maintain a comfortable and healthy indoor environment.

Properly designed and maintained HVAC systems can provide energy-efficient and cost-effective heating and cooling, while also improving indoor air quality and reducing the risk of health problems associated with poor air quality.