The definition of a custom air is a system of air conditioning that is designed to meet the specific needs of a particular space. This type of air conditioning is typically used in larger commercial and industrial buildings, as well as in residential homes. Custom air conditioning systems are designed to provide the most efficient cooling and heating for the specific environment. They are designed to provide the best air quality and energy efficiency, while also providing the most comfortable temperature for the occupants. Custom air conditioning systems are often more expensive than standard air conditioning systems, but they are worth the investment as they provide superior performance and efficiency. Custom air conditioning systems are also more efficient in terms of energy consumption, as they are designed to use less energy than standard systems. Custom air conditioning systems are designed to provide the best air quality and comfort, while also being energy efficient.