At Lone Star Mechanical, your comfort is our priority. For A/C systems that require 410-A refrigerant, this will be the last year for your system to be charged with this product. We can still maintain your unit, but we recommend you upgrade your system with the new R-454B Refrigerant for optimal performance. Enjoy 20% off for first-time customers when you choose us for your HVAC needs. Trust us to keep you comfortable with our top-notch services and expertise.