What type of cooling system uses ACR copper tubing?

The choice indicating Type L, dehydrated copper tubing is indeed the correct answer, as Type L copper tubing is commonly used in air conditioning and refrigeration (ACR) applications. This tubing is characterized by its thicker wall compared to Type M copper tubing, which makes it better suited for high-pressure environments typically found in cooling systems. The "dehydrated" aspect refers to the fact that this copper tubing is often used in applications where moisture must be minimized to prevent damage to the system and ensure efficiency.

In ACR applications, the integrity of the refrigerant is crucial, and using Type L, dehydrated copper tubing helps achieve that by reducing the risk of contamination and ensuring that the system operates as intended. This is why it’s the preferred choice for such systems, while other types of tubing may not meet the necessary standards for durability and moisture resistance.