Final answer:
The preferred method for cutting copper tubing in refrigeration is using a pipe cutter, as it provides a clean, straight cut important for system integrity.
Step-by-step explanation:
The preferred method of cutting copper tubing for a refrigeration system is with a pipe cutter. This tool is specifically designed to create a clean cut without deforming the tube, which is critical in maintaining the integrity of the refrigeration system. Using a pipe cutter ensures a straight edge and reduces the risks of leaks at joint connections, whereas tools like a hacksaw can create uneven edges and potentially leave behind metal shavings that could contaminate the system.