Even though a humidifier doesn't help allergies, it's not completely useless. Per the Review of Purifiers, a humidifier is specifically designed to increase the moisture in the air, making it easier for people to breathe and even in some cases to sleep. Plus, a humidifier is a perfect solution for clearing the air during the dry season. And, let's not forget to mention how inexpensive a humidifier is compared to an air purifier.

There are some cons to a humidifier, though. While moisturizing your air, your furniture and carpet may become damaged in the process, the Review of Purifiers added. So, if you have all carpet floors, you may want to look into another product.

Furthermore, an air purifier may not be a feasible solution either. Though an air purifier works great, its relatively expensive cost makes it inaccessible for some. And, let's forget that by purifying the air, harmful chemicals are released too — a potential medical problem you don't want in the future. All in all, both of the products, while great, have their advantages and downsides.