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I have a residential air handling unit that provides home heat and hot water. In the spring, we noticed that our air conditioning in the house was not functioning properly. An expert adjusted the speed of the Handling unit. Now that it is winter, we have noticed that the home heat works, but the hot water will not work unless the air handling unit is running. If I turn up the thermostat and the unit turns on, the water will go from cold to hot. Do I need to adjust the speed setting of the air handling unit in different seasons? Thank you.