Greater air flow means less humidity?

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Old 05-18-19, 05:11 AM
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Greater air flow means less humidity?

Trying to remember if I correctly understand what an AC tech said. I think he said the fan runs higher RPMs in cooling mode partially to remove more humidity. Is that correct? I see my furnace blower runs only about 50 RPMs faster in AC mode than heat mode. However, if I turn the blower to always on it turns at the heat speed. I know it runs continuously so I assume I still get more than enough of the dehumidifying effect. Correct?
 
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Old 05-19-19, 09:10 AM
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The dehumidifying effect will be affected by the amount of airflow but if your furnace/thermostat combination is not equipped to control moisture it will change speeds because cooling generally requires about 30% more air volume than heating.
 
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Old 05-19-19, 09:53 AM
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It is a 20 year old Bryant propane furnace and 10 year old Carrier AC system. Not so sophisticated. It has a four speed motor but only two speeds on the circuit board. Thermostat is basic as well. Just a heat or cool option and fan auto or on. I assume a fancier thermostat would not do any more because of the basic furnace.
 
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