What is the typical air temperature range for a mid-efficiency, category 1 gas furnace?

The typical air temperature range for a mid-efficiency, category 1 gas furnace is between 40°F and 70°F. This range is crucial for the furnace's operation, as it indicates the temperature of the air being supplied into the living spaces. Mid-efficiency gas furnaces are designed to operate effectively within this range, where they can achieve optimal combustion and ensure efficient heating.

In practical terms, this means that when the furnace is running, it can produce air that is warm enough to provide comfort in a residential setting, but not excessively hot that it risks overheating or causing discomfort. Understanding this temperature range helps technicians troubleshoot issues, ensuring that the furnace operates safely and efficiently.

Other ranges mentioned do not align with standard operations for mid-efficiency gas furnaces. For instance, a significantly lower temperature range, such as from 20°F to 40°F or 30°F to 50°F, would not be conducive to comfortable heating. Similarly, a range like 60°F to 80°F may be too high for a mid-efficiency furnace, which typically operates at optimal efficiency below that threshold.