How to Improve Indoor Air Quality: 13 Tips for Fresher, Healthier Air at Home

Your home is a haven, but if you experience respiratory issues and allergies indoors, poor air quality is most likely to blame. Whether your specific problems are caused by dust, pet dander, mold, or even volatile organic compounds (VOCs), understanding how to improve indoor air quality should be a priority. Let's turn your dwelling into the healthy space you deserve.

1. Start With an Indoor Air Quality Assessment

Your first order of business is to understand the current state of your indoor air quality. A professional assessment will provide accurate readings for allergens, radon, and other harmful contaminants. The cost for an indoor air quality assessment ranges from $290 to $585, but your actual out-of-pocket costs depend on your home's size and location.

2. Have Your Ductwork Professionally Cleaned

Your home's ductwork can be the hidden culprit behind poor indoor air quality. Dirty air ducts can circulate dust, allergens, bacteria, mold, and other airborne nasties throughout your abode, triggering respiratory problems. Hiring a local duct cleaning service will remove the buildup so you can enjoy the benefits of duct cleaning—a fresher, cleaner, and healthier home.

Homeowners can expect air duct cleaning costs to range from $270 to $505. The exact amount you pay depends on your location, the type and size of your ductwork, and the total number of vents throughout your home.

3. Use Exhaust and Extractor Fans

These fans are both commonly found in kitchens and bathrooms. When switched on, they remove moisture, cooking odors, and other airborne contaminants from everyday activities. Running these fans during and after cooking or showering keeps the air at home fresh and breathable.

4. Open Windows and Doors

Good old-fashioned ventilation—simply opening windows and doors—plays a key role in keeping indoor air fresh. Letting in outdoor air is an easy way to improve air quality, but only when the Air Quality Index (AQI) indicates the air is reasonable or moderate to avoid bringing in pollutants.

5. Install an Air Exchanger

Air exchangers replace stale indoor air with freshly filtered air. As a result, they reduce humidity levels, remove pollutants, and prevent airborne contaminants from building up inside your home. 

Most air exchangers are installed in basements, attics, or utility rooms and connected to the home's existing ductwork to distribute fresh air efficiently throughout the space.

6. Replace and Maintain HVAC Filters Regularly

Your HVAC system not only heats and cools your home but also significantly contributes to keeping indoor air healthy—but that only happens when the filters are clean.

Clogged, dirty filters trap pollutants and seriously reduce indoor air quality. Plus, dirty filters restrict airflow, making your system work harder, which can waste energy and eventually damage your system.

To keep your air clean, replace your HVAC filters every one to three months or as the manufacturer recommends. Homes with pets or unusually high dust levels may need more frequent changes. Homeowners can expect HVAC filter replacement costs to hover around $10 to $50.

7. Reduce Indoor Allergens With Frequent Cleaning

Regular cleaning to remove dust and other pollutants will help control these irritants and create a healthier home environment. Your vacuum cleaner is one of the best tools in your home's arsenal, especially if it uses a HEPA filter to trap airborne particles that settle in carpets and furniture.

Dusting is also a great way to make your indoor air fresher. Use a damp cloth to stop particles from becoming airborne. Soft surfaces like bedding, curtains, and rugs harbor allergens. Washing these items often helps remove dust mites and other irritants. 

8. Control Humidity Levels to Prevent Mold Growth

While humidity can be good for your skin, excessive amounts create the ideal breeding ground for mold and even yucky dust mites to thrive in your home. Your indoor humidity levels should be ideally below 50%, so use a dehumidifier in damp spots, such as bathrooms and basements.

Address any leaks or water damage STAT to stop mold before it starts. It's also a good idea to keep your air conditioner running during the hot and humid seasons.

9. Eliminate Harmful Chemical Pollutants

Your home likely contains several household products that contain volatile organic compounds (VOCs) that negatively impact indoor air quality. Cleaners, paints, synthetic air fresheners, and even new furniture can emit these harmful chemicals, which can cause respiratory irritation and long-term health concerns.

Reducing exposure to VOCs is an easy way to improve the air you breathe. To do so, choose natural alternatives whenever possible.

10. Use Air-Purifying Plants

Indoor plants are a win-win because they improve your home's aesthetics and air quality. Many types naturally filter airborne toxins in addition to absorbing carbon dioxide, like the spider plant, which also sucks up carbon monoxide and formaldehyde. The snake plant is no slacker, either. It's known for removing and absorbing toxins like benzene and xylene.

11. Get a Free-Standing Air Purifier

If you want extra air filtration, an air purifier in high-traffic rooms will remove dust, dander, mold spores, and other toxins from your air. Choose a HEPA-certified purifier that captures even the smallest particles for the best results. The best part is that these units are compact and easy to move from room to room.

12. Test for Radon and Carbon Monoxide

Radon and carbon monoxide are invisible, odorless gases that pose serious health risks if undetected.

So what to do? Protect your home by installing carbon monoxide detectors on every level and test them regularly to ensure they’re working correctly. Conduct a radon test to check for dangerous levels of this radioactive gas, especially if you live in an area prone to radon exposure. The average cost for professional radon testing is $420. 

13. Consistently Monitor Your Home’s Air Quality

One of the best ways to protect yourself and your home investment is to watch proactively for indoor pollutants. Purchasing a smart air quality monitor will help you track changes in real time, measuring factors like humidity, CO₂ levels, and airborne contaminants. Even better, these gadgets can send instant alerts and recommendations whenever the air quality drops.