[throw0101a]

Most people just install A/C and call it a day. If you live in a humid area, then a separate whole-house dehumidifier is useful:

* https://www.santa-fe-products.com/product-category/dehumidif...

You can have a comfortable temperature 21C/72F, but a too-high RH, and since the temperature is correct, the AC won't kick in. Having an hygrometer helps with this.

[hordeallergy]

A/c in the context of the article?

[throw0101a]

Whole-house dehumidifiers are more popular in humid climate zones, which also tend to be hot/not-cold. Though there are places that are both, at times cold and hot/humid:

* https://en.wikipedia.org/wiki/Humid_continental_climate

However, the general point stands in mostly-cold zones: it is possible to control humidity independently of temperature.

Also, most people want good indoor air quality, so bringing in filtered outside air, and tempering it with exhausted stale air is becoming more common (and is part of the building code in many regions):

* https://www.ecohome.net/guides/2276/choosing-between-an-hrv-...

* https://www.venmar.ca/23-detail-faq-en-what-is-the-differenc...

And that venting could help control humidity as well.