I disagree with your advice vis-à-vis indoor humidity. Low indoor humidity dries out your mucous membranes and thereby weakens your defense against an airborne pathogen.
During heating season, indoor environments without a humidifier will typically have a relative humidity of 20-30%, which is sub-optimal. If you have a humidifier, use it to raise the relative humidity to about 45%.
During the heating season, you certainly do not want to use a dehumidifier.
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