A bit of semantics here, but antifreeze/coolant is what goes in the car's cooling system to keep the engine from overheating during operation and used by most vehicles to provide cabin heat for the passengers. Refrigerant is what's in the A/C system that is used to remove moisture from the air and cool the passenger compartment.
If you go to a shop and ask to have the "coolant flushed" or the "coolant topped off" you will likely be disappointed in what you receive, unless the shop is good about asking clarifying questions.
-Rod