What information do HVAC technicians gain from metering devices?

HVAC technicians utilize metering devices to obtain real-time data on system performance and efficiency. This immediate feedback is essential for diagnosing issues, optimizing system operations, and ensuring that HVAC systems are running efficiently. Real-time data allows technicians to assess parameters such as temperatures, pressures, and flow rates, enabling them to make informed decisions for repairs and adjustments that will enhance the system's overall efficiency and reliability.

In contrast to the other options, real-time data provides actionable insights that can lead to immediate improvements rather than past records or theoretical predictions. While historical data or seasonal averages might offer some context or trends, it is the live feedback from metering devices that truly guides technicians in their troubleshooting and maintenance tasks, making option B the most relevant and beneficial information derived from these tools.