#mold

A mold-resistant humidifier for the winter dry-air stretch. High desert winters pull indoor humidity well below comfortable, and the humidifier itself is the thing most likely to cause a problem.

Open the house wide for 15+ minutes a day, every day, summer and winter, to flush stale air, drop CO2, and keep humidity below the line where mold starts. Measured before and after with an Airthings monitor.