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15. Improve circulation

Overzealous weatherproofing and a lack of exhaust fans can create an uncomfortably airtight home. Sealing drafts prior cold weather is a smart idea, but before being too aggressive with the caulk gun, make sure air is still able to circulate. Heating sources such as wood-burning stoves can also hurt air quality. Make sure your home is not only energy-efficient but also has healthy air by using a HEPA filter in your heating unit and having properly-sized exhaust fans in all bathrooms.

Wood stove Westhoff / Getty Images
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