How is the condition of an HVAC system monitored?

The monitoring of an HVAC system is a comprehensive process that encompasses various methods to ensure optimal performance and efficiency. Regular visual inspection allows technicians to identify visible signs of wear, leaks, or other obvious issues that may affect the system's operation. This hands-on approach helps catch problems early, before they lead to significant failures or costly repairs.

Manifold gauge readings provide critical data about the refrigerant pressure in the system. Understanding these readings is essential for diagnosing issues such as improper refrigerant levels or blockages in the system. Being able to interpret these gauges helps in evaluating whether the HVAC system is operating efficiently within its intended parameters.

Temperature sensors play a vital role in monitoring the system's operation by measuring the air temperature at various points. They help ensure that the system is delivering air at the correct temperatures and can alert technicians to problems like overheating or inadequate cooling.

Therefore, combining regular visual inspections, manifold gauge readings, and temperature sensor data provides a comprehensive overview of an HVAC system’s condition, making the answer that includes all of these methods correct. Each method contributes uniquely to the overall assessment and maintenance of the system.