Air Duct Cleaning FAQ: Cost, How Often & What to Expect in Madison

The honest answer first: the EPA does not recommend cleaning ducts on a routine schedule, and it says duct cleaning has never been shown to prevent health problems. What the EPA does recommend cleaning for is visible mold inside the ducts, vermin, or debris that is actually blowing into your rooms.

We work from the system rather than the calendar. That usually lands around every 3 to 5 years, sooner with pets, allergies, a recent renovation, or a house whose history you do not know. We look before we quote, and we will tell you if yours can wait. More on our air duct cleaning page.

Sometimes, and we will tell you which. The EPA says (opens in a new tab) duct cleaning has never been shown to prevent health problems and does not recommend it on a routine schedule. It does say cleaning is warranted when there is visible mold inside sheet-metal ducts, when ducts are infested with rodents or insects, or when they are clogged with enough dust and debris that particles are actually released into the rooms. In our experience three more situations earn it: a home fresh from construction or a drywall renovation, a house whose history you do not know, and a system that smells when it first kicks on. If we look at your ducts and they do not need it, we say so and you keep your money — that costs us a job today and earns us the next one.

Most single-system homes take about 2 to 4 hours. Large two-stories or homes with two furnaces can run longer, and we tell you the realistic window with your quote — not after we have started.

Every supply run and every return run, all the registers and grilles, and the blower compartment where buildup is heaviest, cleaned with a 7,000 CFM push-pull system: a commercial vacuum under negative pressure at the trunk while compressed air agitates each line toward it. That is the whole-system standard the National Air Duct Cleaners Association (NADCA, 2026 homeowner guidance) describes, and it is why a price that only covers “the vents” is not the same job. You get photos of what came out before we leave.

What we can tell you honestly: cleaning removes the dust, dander and debris sitting in the ductwork, and you can see what came out in the photos. Customers most often notice less dust settling and a system that no longer smells when it first kicks on.

What we will not tell you is that it will fix your allergies or lower your power bill. The EPA has not found duct cleaning to prevent health problems, and anyone promising you a health outcome is selling. If odor is the real problem, deodorizing and sanitizing after a cleaning is the honest next step.

Once, yes. Builders rarely clean systems after drywall sanding, so new construction circulates fine dust for its first couple of years. One post-construction cleaning resets it; after that, a normal 3–5 year cycle.

Occasionally, and we handle it honestly: we photograph it and show you exactly what we see. Duct sanitizing does not eliminate mold, so we never sell it as the fix. Growth means moisture, and that gets found and fixed first; a small patch on sheet-metal duct can be cleaned, and anything more than that — or any growth on insulated or fiberglass duct — is a job for a remediation specialist, which we will tell you plainly instead of inventing an emergency. No scare tactics — that’s a promise.

Not by itself. A return grille is the one place every bit of room air passes on its way back to the furnace, so it collects dust in normal operation — a dusty grille proves the filter is doing its job, not that the trunk lines are loaded. What does point to a dirty system: dust that returns within a day or two of cleaning the registers, debris you can see when you pull a supply register, a musty smell when the fan first starts, or a home that has never had the ducts opened since construction. Vacuum the grille; if the other signs are there, have someone look inside.

They do different jobs. A filter catches particles moving through the system from now on; it does nothing about what already settled in the ductwork, and no filter reaches the return side upstream of it. A good pleated filter (MERV 8–11 on most residential systems, or whatever your furnace maker rates the blower for) is the best thing you can do between cleanings, and the EPA’s guide to filters (opens in a new tab) explains what the ratings mean. Neither one fixes the source of a pollutant — a damp basement or a smoking dryer vent — and we will tell you when that is the real problem.

We will not promise it. The EPA is plain that duct cleaning has never been shown to prevent health problems, and it is not a medical treatment — anyone with symptoms should talk to a clinician, not a duct cleaner. What cleaning does is remove the dust, dander and debris sitting in the ductwork so the system is not redistributing it; many customers with pets or allergies tell us the house feels fresher afterward, and we show you what came out so you can judge for yourself. Pairing the cleaning with a better filter and fixing any moisture source does more for allergy households than the cleaning alone.

No. Radon is a gas that seeps in from the soil; it is not something sitting in the ducts, and cleaning them does nothing about it. Southern Wisconsin has some of the higher radon levels in the country, and the Wisconsin Department of Health Services (opens in a new tab) recommends every home be tested; a test kit costs a few dollars, and elevated results are fixed by a radon mitigation contractor (DHS keeps the list), which we are not. We mention it because homeowners asking about air quality often have not tested, and it is the one indoor-air problem that a duct cleaning cannot touch.

Nationally, NADCA’s range for an average home is $450–$1,000 and Angi’s 2026 average is $389 (range $150–$800). What moves the number in a Madison house is the count of supply vents and returns, whether you run one furnace or two, how the trunk lines are laid out, and how hard the system is to reach — layout matters more than square footage. A compact Monona ranch and a two-furnace Middleton two-story are different jobs and their prices should look different. We count, we quote one written number that covers the whole system, every vent and return included, and that is the number you pay.

Industry guides put a standalone dryer vent cleaning at roughly $80–$250 (HomeGuide, 2026) or $100–$170 (Angi, 2026). The run length is what matters: a short straight exit through a basement wall is at the low end; a long run to a roof cap, or one with several elbows, takes longer and costs more. Done together with a duct cleaning it is cheaper than booked alone. Written number first, either way.

Because $99 is the price of getting a crew into your basement, not the price of cleaning your ducts. NADCA’s 2026 homeowner guidance warns about very low “whole house” specials because they usually leave out the air handler, blower, coil, registers or the access openings a real cleaning needs — and the number climbs once the work starts. Ask any company two questions before you book: does the price include every vent and every return, and what happens to the price if they find something? Our answers are yes, and nothing.