People need to be comfortable with the temperature and humidity of indoor air. When the weather is hot and humid outside, most people seek comfort inside from air conditioning units. Air conditioning pulls air from outdoors and cools the air as it enters a house or building. HVAC systems provide thermal comfort through temperature and humidity control. The other important component is air.
Air is fundamental for everyday activities and healthy living.
We need air indoors and outdoors to breathe and survive. Air is a mixture of invisible, odorless, tasteless gases that surround the Earth. It has no shape of its own, but takes the shape of the object it fills. Even though air is invisible, it still has weight. Air can be a light breeze, a strong wind, fill up an empty space, and carry sound.