Final answer:
Technicians are responsible for ensuring the safe disposal of refrigerant in household refrigerators, with the condenser in cooling systems converting gas to liquid.
Step-by-step explanation:
The EPA's "safe disposal requirements" make the technician responsible for ensuring that all refrigerant has been removed from household refrigerators before they are disposed. This is important because refrigerants can be harmful to the environment if not handled properly. When it comes to air conditioning systems, it is the condenser that converts gas into liquid, which is part of the heat exchange process that cools the interior of a building or a household refrigerator. Proper management of hazardous waste, as outlined by the RCRA framework, also includes careful handling of refrigerants from the point of creation to final disposal, to protect human health and the environment.