Proper recovery techniques require the use of recovery equipment certified by which entity?

The correct response highlights the importance of utilizing recovery equipment that is certified by the Environmental Protection Agency (EPA). This requirement ensures that the equipment meets specific standards for safety and environmental protection, particularly regarding the recovery and management of refrigerants. The EPA regulates substances that can harm the ozone layer and establishes guidelines that recovery equipment must adhere to, ensuring it effectively captures and recycles refrigerants without harmful emissions.

By emphasizing EPA certification, the correct answer reinforces the need for compliance with federal laws designed to protect environmental health. While the equipment manufacturer, EPA-approved laboratories, and Underwriters Laboratories (UL) may play significant roles in equipment safety and standards, the EPA's certification specifically addresses the regulations surrounding refrigerant recovery. Therefore, using EPA-certified equipment aligns with best practices in the HVAC industry for environmental stewardship.