“An air purifier will act as an added layer of protection for the humidifier, helping prevent microbial growth by reducing the levels of mold spores and bacteria within the air,” explains Rubino.

We spoke to allergy and medical experts, and they both say an air purifier or humidifier can be effective. Humidifiers, though, if used improperly, can cause more harm than good.

For a humidifier, consider the Dyson Pure Humidify + Coo l ($800). It takes everything you love about Dyson’s top-line air purification technology and adds a humidifier.

Air purifier-humidifier combos on the market that are rated for large spaces are hard to come by. This model from Sharp is the exception, effective in rooms up to 2,603 square feet.

The humidifier also purifies air but at the same time, it also adds much-needed moisture to the air present inside which is lacking as the toxins stick to the air droplets and repel the moisture.

From the exterior box alone, you’d be forgiven for thinking the Dyson Purifier Humidify+Cool Formaldehyde PH04 is a sizeable piece of tech. Yet once unwrapped, this proves not to be the case ...

Humidifier vs. Purifier: We Asked Medical Experts Which Is Better for Allergies© ArtistGNDphotography/Getty Images ArtistGNDphotography/Getty Images D3sign/Getty Images Dmitrii Marchenko/Getty Images ...

The factually named Dyson Purifier Humidify+Cool Formaldehyde PH04 is one multitasking device. Adding formaldehyde fighting as part of the purifying function is an interesting and important addition.

In T3’s Dyson Purifier Humidify+Cool Formaldehyde review, I put this air purifier, humidifier and fan hybrid to the test to see if it lived up to the hype… and the hefty price tag.