Why should you never mix your own refrigerants?

• A. It's illegal, it can cause equipment failure, mix has unpredictable temperature.
• B. It is cheaper and safer.
• C. It improves efficiency.
• D. It is allowed with EPA approval.

Answer: (A)

Mixing refrigerants is dangerous and illegal because refrigerants are tightly regulated to prevent cross-contamination and environmental harm. Each refrigerant has its own chemistry, pressure behavior, and lubricant compatibility. When you blend different refrigerants, you create a new mixture with unknown properties, making it impossible to predict how it will behave in a system. That can push pressures and temperatures outside safe limits, risking compressor damage, leaks, and unsafe operating conditions. It also complicates recovery and reclamation, which is required by EPA rules to avoid improper disposal and environmental harm.

That’s why the best answer points out that mixing refrigerants is illegal, can cause equipment failure, and results in an unpredictable mixture. The other statements don’t fit because they suggest safety, lower cost, or official permission, none of which align with regulatory and safety requirements.