What service is typically needed for older gas furnaces?

Older gas furnaces often require frequent costly repairs due to wear and tear from years of operation. As these systems age, components such as heat exchangers, ignitors, and gas valves can become less reliable and more prone to failures. This can lead to breakdowns that necessitate repairs, which can be more frequent as the furnace continues to age.

Proper maintenance can extend the life of an older gas furnace, but it is common for older systems to develop issues that result in the need for more repairs compared to newer models. This reality makes option B the most accurate choice, as it reflects a typical situation for older gas furnaces.

While upgrades and replacements could also be considerations for older systems, the emphasis on frequent repairs captures the ongoing maintenance challenges faced by homeowners with aging equipment. Regular inspections and timely repairs are critical to ensuring safe operation and efficiency, but these actions often lead to added costs in repairs over time.