Post install walk-through on recently installed equipment and maintenance on older system. Inspect blowers, evaporators and ductwork. Treated drain lines with drain solutions. Test thermostats for proper operations. Newer system is hung square and level. Drains are flowing properly and PVC is insulated.Check outdoor units. Proper breaker and disconnect is installed in the new system. Refrigerant levels good on both systems. Run capacitor and contactor OK on older system. System is operating at manufacture specs at this time.