Evaporative coolers ("swamp coolers"): cool air, high humidity
Common in the desert Southwest, evaporative coolers add 20-40 grains of moisture to the air for every degree of cooling. Different dynamics than AC, and a different humidity playbook.
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Reducing indoor humidity: dehumidify, ventilate, repair
The 30–50% RH band is the IAQ sweet spot. Above 60% RH for sustained periods, mold and dust mites become a problem. When humidity is stuck outside the band, four causes cover almost every case.
Raising indoor humidity: winter dryness and how to fix it
Cold outdoor air holds little water; once heated indoors, RH drops below 30%. Static, dry skin, respiratory symptoms, and infection-transmission risk all rise.
Basement IAQ: a different environment from the rest of the house
Basements run cooler, more humid, and lower-ventilated than the floors above. The HVAC lives down there, the water heater lives down there, and so do the paint cans, the radon, and most of the mold problems.
