Humidity is best reduced with refrigeration. Heating air (furnace) does not significantly reduce humidity through heat. Often repeated misconception.
Running a gas fired heater in cold weather may bring about humidity reduction by introduction of out-side air. This comes about either through outside furnace combustion air or a mixed portion of outside air at the return plenum by design. Or possibly through normal house venting as furnace runs.
Applications requiring tighter control for humidity in the hvac world is achieved by first refrigerating (dehumidify) the air stream and then add any desired re-heat followed by re-humidifying air stream to target level. This is all done in the air ducts. Respectfully, tim
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