You may be searching for the best air purifiers for allergies, pets, mold, wildfire smoke, or exhaust—such as from cars or industrial buildings—to protect yourself and your home from potentially harmful air pollutants, especially as the seasons change.

As winter creeps in and the outside air gets colder, having a good air purifier for your living space (especially your bedroom) is essential to reducing airborne particles. Closed windows and older heating systems often trap stale air and indoor pollutants, and microscopic allergens like pet dander and dust mites circulate your home instead of wafting outside. Plus, heating devices like fireplaces, furnaces, and heaters can create soot, dust, and other potentially harmful odors.

If you don't want to break the bank on a large, expensive whole-house air purifier, a smaller, more portable one can still be extremely beneficial to your health. You can move it around your house and keep it in your bedroom to help keep the air healthy and germs at bay as you sleep.

These on-sale, WIRED-tested air purifiers below can help make your home healthier this winter for less. All of these picks have HEPA filtration options, which capture microscopic airborne viruses, bacteria, and respiratory droplets that increase the likelihood of illness, especially when people spend more time indoors together during the colder months. Keeping the air continually filtered and circulating also helps ease asthma triggers, congestion, and allergy flare-ups that often get worse as the temperature drops.

As we move toward winter and temperatures drop, this combo heater-air purifier may be the answer to your prayers.

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