What Difference Can I Expect in My Home’s Air After Installing a NovusAer?
- Dan Dearden
- Apr 2
- 2 min read
Response by Dan Dearden, CAFS
The difference in your home’s air after installing a NovusAer is immediate.
As soon as air starts moving through the system, the particle count in your home begins dropping. That includes larger particles like dust, smaller particles like PM 2.5, and even ultrafine particles down to PM 0.1.
How clean your air gets after that depends mostly on three things:
Whether your HVAC fan runs continuously (Fan On) or only when heating or cooling is needed (Fan Auto)
How much outside air leaks into your home
Whether you have a depressurization duct installed
How Clean Can the Air Get?
Air is generally considered clean when PM2.5 levels are below 5 micrograms per cubic meter (µg/m³).
In most homes, a NovusAer will fall below that level even if the fan runs only in Auto mode.
If you run the fan continuously and have a depressurization duct, you can get the air even cleaner—often below 1 µg/m³.
For example, even on some of the worst air-quality days, my home has measured 0.2 µg/m³ indoors. During the winter of 2025–2026, Salt Lake City had some of the worst outdoor air in the country for several days, but inside my home, the air stayed extremely clean.
Fan Setting Makes a Big Difference
If your thermostat is set to Fan Auto, the fan only runs when your system is heating or cooling.
That means the NovusAer only cleans air when air is moving through the HVAC system.
If you want the cleanest air possible, set the fan to Fan On so it runs continuously.
That keeps air circulating through the purifier all day, and your home stays cleaner because the system never really stops filtering.
HVAC systems are designed to do this, so continuous fan operation is not a problem.
How Your Home Affects Air Quality
Every home leaks air.
Clean air leaves through small gaps and cracks, and outside air comes in to replace it.
That’s just how houses work.
In a tightly built home, all the air inside may be replaced about once every three hours. In the average home in the USA, it happens about once every hour.
So while your air purifier is cleaning the air, outside air is constantly bringing new particles back in.
The tighter the house, the easier it is to keep the air clean.
Want Even Cleaner Air? A Depressurization Duct Helps
This is where a depressurization duct can make a real difference.
Instead of letting outside air sneak in through random cracks and openings, the duct provides a controlled path for replacement air into the home.
And because that air comes through your filtration system first, it gets cleaned before it enters your living space.
That helps keep particle levels lower and makes the whole system work even better—especially when outdoor air quality is poor.
Bottom Line
A NovusAer starts improving your air immediately.
If you want the best results:
Run your fan continuously
Keep your home as tight as possible by “weatherizing” your home
Add a depressurization duct if you want maximum performance
Those three things together can give you exceptionally clean indoor air—even when the air outside is not so great 🌬️🏠
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