Replacement coils are components used in various devices, such as vape pens and air conditioning units, to ensure proper functionality. In vaping, coils heat the e-liquid to produce vapor, while in HVAC systems, they help transfer heat. Over time, these coils can wear out or become less efficient, necessitating replacement. Replacing coils is essential for maintaining optimal performance and prolonging the lifespan of the device. For vape users, a burnt or damaged coil can lead to poor flavor and vapor production. In air conditioning systems, faulty coils can result in inadequate cooling, leading to increased energy consumption and discomfort.