Ventilation is Essential
Proper ventilation is essential for healthy indoor air. Ventilation dilutes and removes pollutants like VOCs, allergens, moisture, and carbon dioxide that accumulate in our homes.
The simplest way to ventilate is to open windows for cross-breezes or run kitchen and bathroom exhaust fans. Some, but not most, home HVAC systems will provide fresh-air intake or energy recovery ventilators (ERVs) to provide consistent fresh air for tightly sealed homes.
Ventilation matters most after activities that release VOCs or moisture, such as painting, cooking, or showering, and in humid conditions or homes with new furniture or renovations still off-gassing chemicals.
Even in hot or cold climates, brief periods of opening windows, just 5 to 10 minutes a few times a day, can meaningfully refresh indoor air without significantly affecting comfort or energy costs. This "burst ventilation" allows stale, pollutant-laden air to exchange with outdoor air quickly, before indoor temperatures shift substantially, making it a practical option year-round, even when continuous ventilation isn't feasible.
Unfortunately, ventilation should be limited during wildfire smoke, high pollen counts, or poor outdoor air quality days, when opening windows may introduce more pollutants than it removes. In these cases, mechanical filtration or air purifiers can help maintain healthy indoor air.
