On some HVAC / furnace systems both the furnace and the A/C fans come on to circulate the hot air quicker. Those settings are adjustable. You must read the instructions. We have a 2019 Thor Hurricane 34j and it has the Firefly control system. When on auto settings both units come on with what the temperature is set at. If you change your settings to manual high or Low fan then only the furnace will come on.
Hope this helps.
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BadmanRick
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