Your Walmart Humidifier Hunt, Decoded Frequently Asked Questions: Your Humidifier Handbook for Walmart 1. Where exactly do you find these moisture-boosting marvels within the retail behemoth? Within that area, look for sections dedicated to Air Quality, Seasonal Items, or Home Environment . If you’re having trouble, use the Walmart app to search for “humidifier” and check the in-store availability and aisle location for your specific store. Remember, layout can vary by location, so consider asking a Walmart associate for assistance if you’re striking out on your own.