What happens to the heating output from the air handler as the outlet temperature decreases in a combination heating system?

In a combination heating system, as the outlet temperature decreases, the heating output from the air handler typically decreases as well. This is because the air handler relies on a thermal exchange process where cooler air requires more energy to reach the desired temperature. If the outlet temperature is lower, it suggests that the air handler is either compensating for colder air entering or that the heat source is less effective.

As temperatures drop, the air handler may struggle to maintain the same level of heating output due to a reduced temperature differential between the air being heated and the air being released. Thus, with a decrease in outlet temperature, there is less thermal energy available to transfer into the space being heated, leading to a decrease in heating output.

In summary, the thermal dynamics of heating systems dictate that lower outlet temperatures correlate with a reduced heating output, making the correct understanding crucial for effective system operation and maintenance.