Colmac Coil’s comprehensive CO₂ (R-744) Refrigeration Reference Guide is designed for engineers, designers, and industry professionals working with natural refrigerants. This guide includes essential data such as pressure-temperature charts, phase diagrams, critical CO₂ system definitions, and comparisons to other refrigerants. Whether you're designing subcritical or transcritical systems, this resource provides the technical insight needed to support high-efficiency, low-GWP refrigeration projects.