The definition of a high performance HVACHVAC system is one that is designed to provide maximum efficiency and comfort while minimizing energy costs. It typically includes components such as a furnace, air conditioner, air handler, and thermostat. These components are designed to work together to provide a comfortable indoor environment, while using the least amount of energy possible. High performance HVACHVAC systems are designed to be more efficient than traditional systems, and they can help reduce energy costs by up to 30%. They are also designed to be more reliable and durable, meaning they will last longer and require less maintenance. High performance HVACHVAC systems are becoming increasingly popular, as they provide an energy-efficient and cost-effective way to keep homes and businesses comfortable.