Thread by @joeyfox85

HUMIDIFICATION 🧵

Humidity control is one of the unused resources in air quality. However, it isn't something that can easily be used in the places where you would catch COVID, but it can be used in your home to prevent you from getting sick when you go out. Why?

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Your body has natural defense mechanisms to prevent catching airborne pathogens. Exposing yourself to very low humidity over long periods of time in the winter weakens this. This can be easily remedied by keeping your home at 40% relative humidity.

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In other words, having good humidity control in your home is actually a scientifically justified "immunity booster". It's very easy to run a humidifier and you will be healthier.

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Why isn't this used in all buildings? Viruses don't survive as long in areas with good humidity control, so it would be great if it was used. Why not?

Short answer is ⏲️&💲.
Humidifiers as part of air handling units are not mandated by ASHRAE, so they cost more to install.

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In some units, like roof top units, it would be very impractical to install a humidifier.

Humidity sensors drift over time, so they would require constant replacement.

Humidifiers rust, so they would need constant replacement.

If it isn't done properly, mold is a concern.

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Another problem is similar to the problem with ventilation: if the fan, heating or cooling are broken, people notice right away and it gets fixed. If the dampers which bring in fresh air or a humidifier breaks, people won't notice and maintenance companies usually ignore it.

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In summary, due to practical concerns, humidity control is not used in most places. If it is installed, it will probably stop working within 5 years. But it can still be done in your home and that helps protect you when you go out. Run a humidifier in your home this winter.

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