Split air window ACs are a popular choice for people with allergies and asthma because they do not require the use of filters. The units typically have three fan speeds, and some even include a humidifier. If you want to own one, check out our list of the best split air window air conditioners for allergy asthma in this article. https://bestappliancesreviews.com/best-split-air-window-air-conditioners-for-allergy-asthma/