Does HVAC take air from outside?

Yes, HVAC systems take air from outside. This air is typically drawn in through a return air duct, which is connected to the outside of the building. The air is then filtered and heated or cooled before being distributed throughout the building. The air is also exhausted from the building through an exhaust air duct, which is connected to the outside. This process helps to maintain a comfortable indoor environment and ensure that the air quality is safe and healthy.