If you use a central air conditioning system to keep your home cool and comfortable during the summer, and a furnace to stay warm during the winter, then you may be putting the quality of your indoor air at risk. This is also true if you keep your windows and doors open often to allow for natural ventilation.
When you use your central HVAC system or leave your windows and doors open, you are inviting airborne pollutants—dust, dirt, pollen—into your home. They can infiltrate your home through leaks in your ductwork or simply from the outdoors. Does this mean that you should stop using your HVAC system as much, or keep your doors and windows closed up more? No, the solution is a lot more convenient than that—a whole-house air filtration system.