Editing Humidifier (section)

===Negative impact of overuse of humidifiers===
{{see also|Dehumidifier}}

An indoor relative humidity of less than 51% resulted in significant reductions in mite and allergen levels.<ref>{{cite journal |last1=Arlian |first1=LG |last2=Neal |first2=JS |last3=Morgan |first3=MS |last4=Vyszenski-Moher |first4=DL |last5=Rapp |first5=CM |last6=Alexander |first6=AK |title=Reducing relative humidity is a practical way to control dust mites and their allergens in homes in temperate climates. |journal=The Journal of Allergy and Clinical Immunology |date=January 2001 |volume=107 |issue=1 |pages=99–104 |doi=10.1067/mai.2001.112119 |pmid=11149998|doi-access=free }}</ref> Overuse of a humidifier can raise the relative humidity to excessive levels, promoting the growth of [[dust mites]] and mold, and can also cause [[hypersensitivity pneumonitis]] (humidifier lung).<ref>{{cite journal|last=Baur|first=X|year=1988|title=Humidifier lung and humidifier fever|journal=Lung|volume=166|issue=2|pages=113–124|doi=10.1007/BF02714035|pmid=3130530|s2cid=23430270|display-authors=etal}}</ref> A properly installed and located [[hygrostat]] should be used to monitor and control humidity levels automatically, or a well-informed and conscientious human operator must constantly check for correct humidity levels.

A humidity below 50% can prevent water condensation on building materials.<ref name="cpsc.gov" />

A [[dehumidifier]] can be used to balance the humidity.