How Healthy is Humidifying REALLY?

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When it's cold outside, most people use a humidifier without a second thought. But is it actually safe to humidify? Some people say that as long as you keep your home's relative humidity between 40 and 60%, you'll be okay. From a building science perspective, that recommendation is not only too general, it also can turn your home into a toxic environment in terms of mold growth and mycotoxin exposure.

In this video, I teach you how to approach humidification without ruining your indoor air quality. Also in this video, I talk to David Fontaine, a systems engineer who is chair of the scientific outreach committee at Change the Air Foundation: https://changetheairfoundation.org/. David will blow your mind about the health effects of mold.

Introduction and background - 0:00
Disease transmission: the origins of the 40-60% RH range - 0:53

Is 40-60% actually a safe RH range? - 3:15
What are the dangers of overhumidifying? - 3:37
Mold and mycotoxins can make people very sick - 4:21
David Fontaine discusses the dangers of MOLD - 5:08

SAFE RH THRESHOLDS - 11:08
What do if your home’s air is TOO DRY - 12:41
AVOID this kind of humidifier - 13:18
Safe humidifier recommendations - 14:23
Alternatives to humidifying - 15:10

WHY WE NEED TO STOP USING RH AS A METRIC - 15:38
Why smart people recommend 40-60%...IDEALISM - 16:49

Ventilation and filtration for disease transmission - 17:27
Best practices for ventilation and filtration - 18:10
THE FIRST LINE OF DEFENSE AGAINST VIRUSES - 18:19

Hospitals are NOT the same as homes - 19:09
A summary - 19:47

Products I recommended for humidifying safely:

-Aranet4 CO2 monitor/hygrometer: https://amzn.to/3FmN7xu
-Vornado Evap40 Humidifier: https://amzn.to/4bRGSg0

Above are affiliate links, which means I earn a small commission if you make a purchase through them. This helps support the channel at no additional cost to you. Thank you for your support!

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Resources:
Scientific review showing that masks prevent respiratory illness: https://journals.asm.org/doi/10.1128/...
My video about DEhumidification (for warmer weather):    • How to Lower Humidity in Your Home Like a ...  
CHANGE THE AIR FOUNDATION: https://changetheairfoundation.org/
Taylor Paper on RH and HAIs: https://www.isiaq.org/docs/Papers/Pap...
Ventilation system deficiencies as the main cause of HAIs: https://www.ncbi.nlm.nih.gov/pmc/arti...
Colorado Children’s Hospital article about humidification dangers: https://www.childrenscolorado.org/con...
Energy Vanguard articles: https://www.energyvanguard.com/blog/A...
https://www.energyvanguard.com/blog/c...
https://www.energyvanguard.com/blog/w...