Inspected an AC unit that was not cooling. The system, which is 20 years old, showed significant rust and wear. Checked refrigerant levels and found the compressor was failing. Due to the unit's age and condition, I provided an estimate for a new HVAC system. Recommended a Carrier Comfort Series 14 SEER packaged system for optimal performance. Advised the customer on energy savings, warranty options, and the benefits of upgrading to a modern system. Regular maintenance will extend the life and efficiency of the new installation.