Humidifiers and Dehumidifiers

Dust mites -- tiny creatures that live in your bed, sofa, and carpet -- are a leading cause of nasal allergies. Keeping indoor humidity low helps control dust mites, which thrive in moist, warm air. But too-dry air can irritate nasal passages and make allergy symptoms worse. Strike a balance by keeping the humidity in your home between 30%-50%. You can monitor it with a hygrometer (about $15). Tabletop humidifiers and dehumidifiers are available at discount and drugstores in the $30 to $100 range.

Remake Your Bed

Keeping dust mites out of mattresses and pillows can help prevent allergy attacks. Choose pillows and comforters filled with synthetic hypoallergenic material instead of mite-friendly feathers. And cut back on the number of throw pillows.