For a typical home, a slow AC refrigerant leak is low-risk but not something to ignore. Modern refrigerants like R-410A and R-454B are not poisonous in the way carbon monoxide is, but in a large leak inside a small, poorly ventilated space they can displace oxygen and cause dizziness, headaches, or difficulty breathing. Direct skin contact with escaping liquid refrigerant can also cause frostbite. The bigger everyday concern is property and environmental: refrigerant is a potent greenhouse gas, and a leaking system loses efficiency, freezes up, and can burn out the compressor if it keeps running undercharged. If you smell a faint chemical odor near the indoor unit, hear hissing, or see oily residue on the lines, turn the system off and ventilate the area. Then call an EPA-certified technician. Reach LA Heating & Air at (818) 660-1062.
