How can a technician assess the performance of a furnace?

Measuring fuel usage and comparing it to heating output is a comprehensive method for assessing the performance of a furnace. This approach allows a technician to determine how efficiently the furnace converts fuel into heat. By calculating the efficiency ratio—comparing the amount of fuel consumed to the amount of heat generated—technicians can identify potential issues such as malfunctioning components, inadequate maintenance, or the need for upgrades.

This performance metric is crucial because a furnace that consumes more fuel than necessary indicates inefficiency, which can lead to higher energy costs and diminished comfort levels in a home. In contrast, while evaluating noise levels, age, brand, or physical condition can provide some insights, these factors do not directly quantify the real operational efficiency of a furnace, making them less reliable for a comprehensive assessment.