Three things settle it, according to the EPA: visible mold growth inside the system, rodents or insects in the ducts, or so much dust and debris that it blows out of your supply vents. Everything else is a clue worth checking, not proof. Our free inspection tells you which one you have.
How do you know if your air ducts need to be cleaned? When you can see the problem, not just suspect it. The EPA’s guide, Should You Have the Air Ducts in Your Home Cleaned?, names three conditions: substantial visible mold growth inside hard ducts or other parts of the system, ducts infested with rodents or insects, and ducts so clogged with dust and debris that particles are released into the home from the supply registers.
That list is shorter than most duct cleaning ads, and it is meant to be. The EPA does not recommend cleaning ducts on a routine schedule, only as needed. We would rather tell you your ducts are fine than sell you a cleaning you do not need, which is why our inspection is free.
Around Philadelphia, a few things push a house toward that list faster: older rowhomes and stone twins whose ductwork was added decades after they were built, renovations that pulled drywall dust into the returns, and damp basements that stay damp through humid summers. We have written up why older Glenside homes hold more dust in their ducts and how humidity gets mold into Cherry Hill ductwork. When the answer is yes, our air duct cleaning covers the whole system.
If you can confirm any one of these, cleaning is worth doing. If you cannot, keep reading before you book.
The EPA’s wording is “substantial visible mold growth” inside hard ducts or on other parts of the heating and cooling system. A musty smell alone does not meet that bar; seeing it does.
Fix the moisture first. The EPA calls controlling moisture the most effective way to prevent growth in ducts, and cleaning without it just resets the clock.
Droppings at a register, nesting material, or scratching inside the ductwork. Older homes with gaps around basement returns see this more than newer ones.
Deal with the pest problem first, then clean, or the ducts get re-contaminated.
A visible puff of dust when the blower starts, or debris landing on or just below a supply register. That is the ducts actively putting material into your rooms.
This is the one most homeowners can check themselves in a minute.
None of these proves it. Each one is a good reason to have someone look inside.
These come up a lot. None of them, by itself, means your ducts need cleaning.
The EPA points out that return registers normally get dusty, because air is being pulled through them. Vacuum it, or pull it and wash it. It says nothing about the inside of the ducts.
That burnt-dust smell on the first cold day of the year is usually dust burning off the heating equipment, and it fades. A musty smell that keeps coming back is a different story.
The EPA says there is no evidence that a light amount of household dust in air ducts poses any risk to your health. Normal is normal.
The EPA says clean as needed, not routinely. NADCA says frequency depends on things like smokers, shedding pets, water damage, allergies or asthma in the house, and recent renovation.
You get the condition first and the recommendation second. If the ducts are fine, we say so.
Photos from our own air duct work across the Philadelphia area. This is what the EPA’s “excessive amounts of dust and debris” looks like up close.
Rebecca and Avi Dadi run the company and treat every home like their own.
Finding out whether you need a cleaning costs nothing.
Every supply, return and register, not just the ones that are easy to reach.
Philadelphia and its suburbs, South Jersey and the Wilmington area.
We are family-owned and based in Huntingdon Valley, working across Philadelphia and Montgomery, Bucks and Delaware Counties, South Jersey and the Wilmington area. Wherever you are, the inspection works the same way, and it is free.
Questions we answer a lot are collected on our FAQ page.
Real reviews from real customers, pulled live below.
Air duct inspection. Find out whether your ducts are on the EPA list before you spend anything.
Sanitation spray, included with every air duct cleaning we do.
Dryer vent cleaning, including cleaning inside the dryer and a new flexible connector hose.
Current offers are listed on our specials page.
The questions homeowners ask most before booking an inspection.
Look for one of the three conditions the EPA names: substantial visible mold growth inside the ducts or other parts of the system, rodents or insects living in the ductwork, or so much dust and debris that particles blow out of your supply registers. Other signs, like recent renovation dust or a musty smell that keeps coming back, are clues worth an inspection rather than proof.
Not by itself. The EPA points out that return registers normally get dusty because air is being pulled through them. Vacuum the grille or pull it off and wash it. What matters more is what the inside of the duct looks like, and that takes a look past the register to judge.
As needed rather than on a fixed schedule. The EPA does not recommend routine duct cleaning, and NADCA says frequency depends on factors like smokers in the home, shedding pets, water damage, residents with allergies or asthma, and recent renovation. A home with none of those may go many years without needing it.
It is one of the best reasons to. Sanding, drywall work and demolition put fine dust into the air, and a system running during the work pulls it into the returns. Wait until the dusty work is finished, then have the ducts inspected so you are not cleaning them twice.
The EPA says duct cleaning has never been shown to actually prevent health problems, and that there is no evidence a light amount of household dust in ducts poses a health risk. Mold growth and pest infestation are different, which is why they are on the EPA list. If you have health concerns, talk to your doctor as well.
Our air duct inspection is free, and every air duct cleaning we do includes a free sanitation spray. The inspection is how you find out whether your ducts need cleaning or just a filter change. Book one through our contact page or call (215) 201-4371.
A free inspection answers it with a look inside your ducts, not a guess.
Air Duct Dynasty · family-owned · 17 Simons Way, Huntingdon Valley, PA 19006
