R22 Refrigerant Top-Up for A/C

I need an experienced technician to top up R22 refrigerant on my central air conditioning system. The system is not experiencing any other issues and was maintained within the last six months.

Ideal skills and experience:
- Certification in handling refrigerants
- Experience with central air conditioning systems
- Knowledge of R22 refrigerant regulations and safety

Please provide a detailed quote and availability.