Refrigerant

Refrigerant is the fluid that circulates through your mini split and actually does the work of moving heat. It absorbs heat from the air inside, carries it out through the line set, and releases it outdoors. Modern mini splits use R-410A or the newer R-32 — both are more efficient and less environmentally harmful than older refrigerants. If your system is low on refrigerant, it usually means there's a leak somewhere. Adding more without fixing the leak is just a band-aid. A licensed technician needs to find and repair the leak before recharging the system.