Which negative consequence results from an oversized furnace operating at low efficiency?

An oversized furnace operating at low efficiency leads to increased wear on components. When a furnace is too large for the space it is meant to heat, it cycles on and off frequently because it reaches the set temperature too quickly. This short cycling puts additional stress on various components, such as the blower motor, heat exchanger, and ignition systems. Over time, this can lead to premature failure of these parts, requiring repairs or replacements that could have been avoided with properly sized equipment.

In contrast to this, an adequately sized furnace would operate more efficiently, leading to less wear and tear on its components over time. Thus, understanding the implications of furnace sizing is critical for maintaining the longevity and efficiency of heating systems.