These shortlists compare air purifiers, dehumidifiers and room air conditioners by room, problem and upkeep. They are desk research from manufacturer documentation and retailer listings, rather than product testing; see how we research .

Air purifiers. Pets , dust , wildfire smoke and cigarette smoke . If allergies are the reason you are shopping, read humidifier or dehumidifier for allergies first, because the right appliance depends on your measured humidity.

Dehumidifiers. Basements and storage areas , bedrooms and apartments under $300 . Size first with the dehumidifier sizing guide .

Air conditioners. Window units and portable units .