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<\/a><\/figure>\n\n\n\n1. Poor Ventilation and Stale Air<\/h2>\n\n\n\n
When it\u2019s chilly outside, it\u2019s natural to close windows and seal up air leaks to conserve heat. The downside? You\u2019re also sealing in airborne contaminants like dust, pet dander, and cleaning fumes. Without proper ventilation, pollutants recirculate through your HVAC system, leading to musty odors and irritation.<\/p>\n\n\n\n
Tip:<\/strong> Consider using a heat recovery ventilator (HRV) or energy recovery ventilator (ERV) to bring in fresh air without losing warmth. Even cracking a window for a few minutes each day can make a difference.<\/em><\/p>\n\n\n\n Cold air naturally holds less moisture, and when you heat it, it gets even drier. This can lead to itchy skin, static shocks, and irritated sinuses. It can also dry out wooden furniture and flooring, causing cracking or warping.<\/p>\n\n\n\n Tip:<\/strong> Use a whole-home humidifier or portable units in bedrooms and living areas to maintain humidity between 30\u201350%. Keep an eye on condensation near windows: too much moisture can lead to mold growth.<\/em><\/p>\n\n\n\n During winter, your HVAC system runs more often, stirring up dust that\u2019s settled in ducts and vents. If you\u2019ve been indoors more, cooking or burning candles adds to the particle load. These small airborne particles can trigger allergies and worsen asthma symptoms.<\/p>\n\n\n\n Tip:<\/strong> Replace your HVAC filter regularly\u2014especially during heavy use. Upgrading to a higher-MERV-rated filter or adding an air purifier can further reduce particulates and allergens.<\/em><\/p>\n\n\n\n Gas furnaces, fireplaces, and space heaters can produce carbon monoxide (CO) and other harmful gases if they\u2019re not venting properly. Because cold weather increases heater use, the risk of exposure goes up, too\u2014especially if a flue or vent becomes blocked by debris or ice.<\/p>\n\n\n\n Tip:<\/strong> Have your heating system inspected annually, and install CO detectors near sleeping areas. Never use an outdoor grill or unvented heater indoors, even for a short time.<\/em><\/p>\n\n\n\n Oddly enough, while indoor air gets drier, hidden condensation can form around poorly insulated windows or pipes when warm indoor air meets a cold surface. This moisture can lead to mold growth in corners or behind walls\u2014problems that often go unnoticed until spring.<\/p>\n\n\n\n2. Dry Indoor Air<\/h2>\n\n\n\n
3. Increased Dust and Allergens<\/h2>\n\n\n\n
4. Combustion Byproducts from Heating Equipment<\/h2>\n\n\n\n
5. Hidden Moisture and Mold<\/h2>\n\n\n\n