How to Improve Indoor Air Quality During a Heatwave
Heatwaves can make indoor air feel stuffy and uncomfortable, especially when temperatures remain high throughout the night. However, good indoor air quality is not only a matter of comfort—it also affects sleep quality, wellbeing, and overall health. In this article, we share practical tips for improving indoor air quality during hot summer weather and keeping your home more comfortable even on the hottest days.
Why Does Indoor Air Quality Deteriorate During Hot Weather?
During summer heatwaves, buildings absorb and retain heat, causing indoor temperatures to rise significantly, especially in apartments and well-insulated homes. At the same time, ventilation performance may suffer if the system is turned down to save energy or if the filters are dirty.
High indoor temperatures can lead to:
- A stuffy and uncomfortable indoor environment
- Poorer sleep quality
- Increased indoor humidity
- Unpleasant odors
- Higher concentrations of indoor air pollutants
Keep Ventilation Running During Summer
One of the most common mistakes is turning off or significantly reducing ventilation during hot weather. Although ventilation does not directly cool your home, it plays a crucial role in removing moisture, carbon dioxide, and other indoor air contaminants.
Proper ventilation helps to:
- Keep indoor air fresher
- Remove excess moisture from cooking and showering
- Reduce feelings of stuffiness
- Improve overall indoor comfort
If your home has a mechanical ventilation system, check the manufacturer’s recommendations for summer operation.
Replace Ventilation Filters Regularly
Dirty filters can significantly reduce the efficiency of your ventilation system. During summer, outdoor air contains high levels of pollen, dust, and other airborne particles that place additional strain on filters.
Clean ventilation filters:
- Improve indoor air quality
- Help ventilation systems operate efficiently
- Capture pollen and airborne contaminants
- May reduce the energy consumption of the ventilation system
As a general rule, ventilation filters should be replaced 2–4 times per year, depending on environmental conditions and system usage.
Take Advantage of Cooler Morning and Evening Hours
Indoor temperatures can be managed more effectively by utilizing the coolest times of the day.
Helpful strategies include:
- Ventilating your home early in the morning and late in the evening
- Creating cross-ventilation by opening windows on opposite sides of the home
- Keeping windows closed during the hottest part of the day
- Using blinds, curtains, or shades to block direct sunlight
These measures help prevent excess heat from entering the building and keep indoor spaces cooler for longer.
Reduce Indoor Heat Sources
Many household appliances generate heat without homeowners realizing it. During a heatwave, pay special attention to:
- Ovens and stovetops
- Clothes dryers
- High-performance computers
- Older electrical appliances
- Excessive lighting
Whenever possible, schedule cooking and other heat-producing activities for the early morning or evening hours.
Don't Forget About Humidity
Although summer is often associated with dry weather, indoor humidity can still build up from activities such as showering, sauna use, and cooking. Managing moisture is important because it directly affects indoor air quality and comfort.
Make sure that:
- Bathroom exhaust ventilation is functioning properly
- Ventilation remains active during moisture-generating activities
- Wet textiles and laundry are dried in well-ventilated spaces
When Should You Check Your Ventilation System?
If your home continues to feel hot and stuffy despite proper ventilation, it may be time to inspect the system. Clogged filters, dirty vents, or incorrect settings can all reduce ventilation performance.
Regular maintenance helps ensure that your ventilation system operates efficiently throughout the year.
