Calefaction is a term used to describe the process of heating something up. Some common antonyms for calefaction include cooling, chilling or freezing. These antonyms describe the contrary process of trying to lower the temperature instead of raising it. Other antonyms for calefaction could include words like "refrigerate," "quench," or "freeze," which all indicate reducing heat. These words all have opposite meanings to calefaction and can be used in different contexts. Knowing antonyms for calefaction can be useful when describing processes, such as cooking or science experiments, or when discussing the effects of temperature on different materials.