Complete system replacement.
We had a HVAC system that was getting old and would trip breakers in very hot weather. They gave us a very reasonable quote for replacement of the system, and didn't pressure us to make a decision right away. A few weeks later we had them install the system.
Install took a little longer then it should have as they received the wrong tonnage A/C unit from the supplier and didn't notice it until they removed the unit from it's box.
The install was done very cleanly and the new unit is working great.
Received a call about a week after install to see if we were happy. Overall a very good job.