The primary drivers for the use of refrigerants are legal framework conditions. The European regulation on fluorinated greenhouse gases and the Kigali Amendment to the Montreal Protocol exemplify this. Both aim to reduce the marketing of refrigerants with high Global Warming Potential (GWP). Consequently, the use of natural refrigerants in refrigeration, air conditioning, and heat pump systems is on the rise. Systems with flammable refrigerants, whether small or large, are gaining particular importance. This includes monoblocs, as well as hermetically se ...