Why your air quality is often worse in winter

Indoor air quality

What happens to your indoor air when you seal your home

When temperatures drop in Central Illinois, we seal our homes tight. Windows go shut, doors get weatherstripped, and the furnace kicks on. The result is an energy-efficient home that holds heat well, but it also holds onto everything else: dust, pet dander, volatile organic compounds (VOCs), mold spores, and airborne bacteria. With little fresh air exchange, these pollutants accumulate to levels that would not be tolerated in summer when windows are open.

One often-overlooked source of winter air pollution is off-gassing. New furniture, carpets, paint, and even some household cleaners release VOCs into the air. In summer, these compounds dilute with natural ventilation. In winter, they build up. Forced-air heating systems can also circulate dust and particles from the basement or crawl space throughout the house. Furnace filters catch larger particles, but they do little for the microscopic pollutants that affect respiratory health.

The humidity problem

Winter air is dry, and running a furnace makes it even drier. Low humidity causes dry skin, irritated sinuses, and cracked wood furniture. It also allows airborne viruses to survive longer. On the other end of the spectrum, some homes struggle with excess humidity from cooking, showers, and poorly ventilated basements. High humidity in winter can lead to condensation on windows and mold growth inside walls. Both extremes are common in Central Illinois homes.

How the SFS air sanitizer helps

The SFS whole-house air sanitizer is a different approach to indoor air quality. Instead of filtering particles, it uses UV light and a photocatalytic process to neutralize airborne contaminants at the molecular level. It goes into your HVAC ductwork and treats every cubic foot of air that passes through, breaking down VOCs, bacteria, mold spores, and viruses. Unlike portable air purifiers, it covers the entire home without taking up floor space or requiring filter changes.

If you notice that your home feels stuffy in winter, or if allergies and respiratory issues seem worse when the heat is on, improved air treatment may help. We offer free consultations to discuss your indoor air concerns and measure the actual conditions in your home.