Identifying poor ventilation in a residential home involves recognizing persistent indoor air quality problems, environmental discomfort, and physical health symptoms. Key warning signs include stagnant, heavy, or stuffy air lingering in rooms, lingering cooking odors or chemical smells that take hours to clear, and high indoor humidity levels that cause condensation to form heavily on windows and promote mold or mildew growth in corners. Occupants may also experience frequent allergy flare-ups, unexplained headaches, fatigue, and respiratory irritation while indoors due to trapped dust, pet dander, and volatile organic compounds accumulating without fresh outdoor air exchange. You can troubleshoot by measuring humidity with a hygrometer. You can verify that ventilation has improved when installing exhaust fans, opening windows, or running energy recovery ventilators eliminates stuffiness and keeps indoor air fresh.
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