Arrived at clients home for single system maintenance inspection. Our client informed me about imbalance airflow in the home. Upon inspection of the ductwork I found that there is a supply vent that is blocked by the drywall. This vent is contributing to airflow and pressure going into other parts of the home causing too much heat or cooling. It is also not cooling/heating the center part of the home. In the attic I found the system to be without a water safety switch and also showed this to our clients. There is some growth on the indoor coil also and we discussed placing a 20*20*4 inch filter to help with pet hair. We also discussed using white vinegar down the drain line to help prevent clogging. On the outdoor equipment I tested and inspected all electrical components and ensured the heat pump was within manufacture specifications. Everything passed inspection today.