A humidifier appeared in our house relatively recently. Normalization of the humidity level facilitates human life and promotes the growth of houseplants and the well-being of pets. And pets are affected by dry air even more than humans, as they are more often exposed to overheating and dehydration because of their fur. I often noticed that my cat spent a lot of time in the bathroom, and I realized that it was because of the humidity there.
Also, there are different models of humidifiers, and they affect Home Air Quality differently. But undoubtedly, it is a necessary gadget in every home.