Mobile software applications can work with Internet-enabled HVAC sensors to help HVAC technicians better install and maintain them. This paper shows how mobile apps can help technicians install Internet-enabled airflow, temperature, pressure, and other types of sensors. A step-by-step installation process shows how mobile apps can aid in fault detection and diagnose issues with HVAC equipment based upon data received from the sensors and mobile apps can better aid technicians in addressing these issues by displaying a decision-tree user interface.