# Why does my apartment require so much water from my humidifier to increase the humidity

**URL:** <https://boards.straightdope.com/t/why-does-my-apartment-require-so-much-water-from-my-humidifier-to-increase-the-humidity/1011329>\
**Category:** Factual Questions\
**Created:** [December 8, 2024, 3:40am UTC](https://boards.straightdope.com/t/why-does-my-apartment-require-so-much-water-from-my-humidifier-to-increase-the-humidity/1011329 "2024-12-08T03:40:44Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Shalmanese](https://avatars.discourse-cdn.com/v4/letter/s/45deac/32.png) [@Shalmanese](https://boards.straightdope.com/u/Shalmanese)\
**Post date:** [December 8, 2024, 8:46am UTC](https://boards.straightdope.com/t/why-does-my-apartment-require-so-much-water-from-my-humidifier-to-increase-the-humidity/1011329/8 "2024-12-08T08:46:27Z")

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> [@markn\_1](#):
>
> The [EPA says](https://www.epa.gov/indoor-air-quality-iaq/how-much-ventilation-do-i-need-my-home-improve-indoor-air-quality) a home should have at least 0.35 air changes per hour. That’s a minimum of 8.5 per day. So 13 per day doesn’t seem unreasonable.

That’s incredibly aspirational though. The Passive House standard, the toughest building standard in the world can be passed with 0.6 ACH. Modern building codes tend to mandate somewhere around 3ACH and older houses would often have 15 - 25 ACH.

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