Yes, air conditioning systems typically require refrigerant to operate efficiently, and over time, they can lose refrigerant due to leaks or normal wear. If you notice your AC isn’t cooling as effectively as it used to, it might be time to check the refrigerant levels and potentially refill it. However, it’s important to have a professional assess and fix any leaks before refilling, as simply adding refrigerant without addressing the issue won’t solve the underlying problem.