What are the main advantages of ammonia as a refrigerant?

Ammonia is one of the most climate-friendly and cost-efficient refrigerants to heat, cool and freeze. It is also:

Non-ozone depleting: Ozone Depletion Potential = 0

Non-climate damaging: Global Warming Potential = 0

Abundant: part of natural cycles, essential for many biological processes

Safe: with proper handling

Energy-efficient: usually better energy efficiency than systems using chemical gases

Cost-efficient: low refrigerant purchase price, low system running costs

Readily available: worldwide