An all air system is a type of heating, ventilation, and air conditioning (HVAC) system that utilizes only air as the medium for heating and cooling. It is one of the most efficient and cost-effective ways to heat and cool a home or business. An all air system uses air as the medium to transfer heat and cold air from one place to another. The air is circulated through a system of ducts and vents, which are designed to evenly distribute the air throughout the building. The air is then heated or cooled, depending on the season, to the desired temperature. This type of system is ideal for homes and businesses that require a consistent temperature throughout the year. It is also an energy-efficient option as it does not require any additional energy sources such as electricity or gas. An all air system is a great choice for those looking to save money on their energy bills.