What EPA actually says
EPA doesn’t recommend routine duct cleaning. It says to clean when one of three things is true:
- There’s substantial visible mold growth inside hard-surface ducts or on other parts of the system.
- The ducts are infested with insects or rodents.
- The ducts are clogged with dust and debris, or particles are blowing out of the supply registers.
EPA also recommends that a gas furnace, stove or fireplace be inspected and serviced before each heating season, to protect against carbon monoxide.
When it’s time sooner in a DFW home
- After a remodel. Sanding drywall and cutting floors puts fine dust in the air, and the return pulls it into the ducts. More on cleaning after a renovation.
- You just moved in. You don’t know what the last owner’s pets, smoking or projects left behind. Moving-in guide.
- After a leak or flood near the air handler or ducts. What to do after water damage.
- Pets that shed, or a house that gets dusty again a day or two after you clean.
- Rodents in the attic. Droppings near ducts or chewed flex duct.
When you can probably wait
If you change a good filter on schedule, haven’t remodeled, and a look inside shows only light dust, you likely don’t need a cleaning yet. At our free visit we’ll tell you plainly if yours can wait.
A five-minute check you can do yourself
- Turn the system off. Unscrew one supply register and shine a flashlight inside. A thin film of dust is normal; thick gray buildup or debris isn’t.
- Look at the return grille and the filter slot. A filter that clogs within weeks points to a dusty system or leaky return ducts.
- Watch the registers when the fan starts. Puffs of dust are a sign.
- Check the attic around the air handler for droppings, torn duct jackets or water stains.
- Take photos. They help any company give you an honest answer.
How to keep ducts cleaner longer
- Use a MERV 13 filter if your system can handle it, which is what EPA recommends, and change it on time.
- Seal leaky return ducts. Returns in a hot, dusty attic pull attic air in, and ENERGY STAR notes that leaks, holes and poorly connected ducts are common in typical homes.
- Keep indoor humidity around 35–50%, the range allergists recommend to limit dust mites.
- Sign up for our free maintenance reminders so filter changes don’t slip.
Questions
Do air ducts need to be cleaned every year?
No. EPA recommends cleaning as needed, not every year. Clean when there’s heavy dust or debris, visible mold growth, or rodents or insects, or after a remodel or water damage.
Does a new house need duct cleaning?
It’s worth a look. Construction can leave drywall dust and debris in the ducts. Have them inspected before you move in, and clean if the inspection shows buildup.
Will you tell me if I don’t need a cleaning?
Yes. At the free visit we show you photos of what we find and tell you plainly what can wait.
Sources: EPA: Should you have the air ducts in your home cleaned? · EPA: What is a MERV rating? · ENERGY STAR: Duct sealing · AAAAI/ACAAI practice parameter: dust mite exposure control