The compressors, valves, cooling agents, and electronic controller are replaced. Cooling agents with high GWP (Global Warming Potential) can be replaced with "green" agents. For instance:

• The R472B agent (GWP=353) can replace R23 (GWP=14800).
• The R452 agent (GWP=2.141) can replace R404A (GWP=3922).

For large walk-in climatic chambers, the power pack (refrigeration unit assembly) and the controller with related software can be replaced.

Why opt for modernization? You have several advantages:

• Lower cost compared to purchasing new equipment.
• Retaining the chamber, which in most cases is in very good condition and doesn't require scrapping.
• Upgrading old equipment to perform like new, extending its usability for another 20 years.