ZAP Knowledge Center
Indoor Air Quality Myths & Truths
Indoor air quality is one of the most misunderstood parts of home comfort. With so many products, filters, gadgets, and conflicting claims online, it’s easy to get confused about what actually improves your home’s air—and what’s just marketing. This guide clears up the most common myths about clean air, filtration, UV lights, humidity, dust, odors, and ventilation so you can make clear, confident decisions for your home and health.
-
Likely return leaks pulling attic/crawl air.
-
Humidity, dirty coils, or drainage issues.
-
Depends on your system.
-
No—avoid them.
-
Yes, if sized and installed correctly.
-
Not well. Ventilation helps more.
-
Filtration, sealed ducts, humidity control, and clean coils.
-
Yes—often 2–5 times worse.
-
Some are. Whole-home options work when properly installed.
-
No. Air quality requires a system approach.
-
Yes—great for coils and microbial control.
-
Not always. Too restrictive can harm airflow.
-
No. It helps but isn’t a complete solution.
-
No—most systems recirculate.
-
Only for individual rooms.
