Air Duct Cleaning FAQ — Littleton, CO

Both sides are partly right. Cleaning is worth it when there is something specific to remove — renovation dust, pet hair, a past pest problem, visible mold, vermin, or debris blowing out of registers. It is not worth it as routine maintenance on a new, well-sealed system with regular filter changes. The EPA: cleaning has never been shown to actually prevent health problems, and is recommended only as needed.

General guidance from NADCA is every 3 to 5 years for the average home, sooner with pets, a recent remodel, or wildfire smoke exposure. The EPA caveat matters most: condition beats the calendar. An inspection shows whether there is buildup worth removing; a date on a calendar does not.

A dryer vent is cleaned at least once a year, and every 6 months with heavy use, pets, or a long vent run. A gas furnace is cleaned at least once a year, before heating season; an oil furnace yearly or more; an electric furnace every 18 to 24 months under guide recommendations. The filter is checked monthly in heating season and replaced every 1 to 3 months.

No price is printed on this site. What affects the cost: system size, the number of vents and systems, how easy the ductwork is to reach, the condition of the ducts, and any add-ons such as dryer vent cleaning or sanitizing. A written quote follows an assessment, and getting written quotes from at least three providers is the EPA advice.

Guides commonly describe a full duct cleaning as a multi-hour job — typically a few hours for an average home, longer for a large home or a second system — with a furnace cleaning at about two hours and a dryer vent cleaning at about one to two hours. Those are typical ranges from guides, not a promise for any specific home. A ten-minute job is not a cleaning.

Ask when booking — providers differ. Some ask the homeowner to be present for the inspection and the walkthrough at the end; others can work with access arranged in advance. The before-and-after camera footage is the proof either way, so ask what proof is provided before booking.

No such relief is promised here. The EPA states that duct cleaning has never been shown to actually prevent health problems, and notes there is little evidence that cleaning ducts alone improves energy efficiency. Cleaning removes what is inside the ducts; it does not change how the system is built or maintained.

Cleaning removes settled smoke particulate from the ductwork, which can reduce the smell that returns each time the system runs. Smell held in furniture, fabrics, and walls needs more than duct cleaning. After a heavy smoke week, check the filter more often and change it when it is loaded.

Three signs point that way: a musty smell stronger when the system runs, dark spots on or around vent covers, and moisture or condensation on vents or ductwork. Those are general guidance, not a diagnosis. Substantial visible mold on hard-surface ducts is one of the three EPA-warranted cases — and the moisture source must be fixed first.

Clothes taking two cycles to dry, clothes hotter than usual, a burning smell, lint around the machine, and an outside flap that barely opens. The U.S. Fire Administration reports that failure to clean is the leading factor in dryer fires, at about 1 in 3. A burning smell means stopping the dryer until it is checked.

Cleaning removes dust and debris from the parts that move air — the blower, the cabinet, the coil area, the filter area. A tune-up is a mechanical inspection and adjustment — the flame sensor, the heat exchanger, safety controls, and gas pressure. Both are annual, and neither replaces the other.

No. The EPA certifies or endorses no duct-cleaning companies, and an 'EPA certified' claim is a false claim. The same applies to instant mold tests and petri-dish scares — the EPA calls the petri-dish tactic inappropriate. A real credential to ask about is NADCA certification, and it should be verified, not taken on trust.

A whole-house special advertised at a very low price that cannot cover a real cleaning, followed by an upsell once the technician is inside — mold found in minutes, sanitizing, sealant. The protection is to ask what is included before booking, and to get written quotes from at least three providers.

Ask five questions: is the furnace included or an extra? What products are used? Who will actually be in the home? How many jobs are done per day? And what proof of the work is provided — before-and-after camera footage? A provider that cannot answer those five clearly is a warning sign.

Littleton 80120, 80123, 80127, 80128; Centennial 80015, 80016, 80111, 80112, 80121, 80122; Englewood 80110, 80111, 80112, 80113; Highlands Ranch 80126, 80129, 80130, 80163; Columbine 80123, 80128; Ken Caryl 80127, 80128, 80465. The full table is on the locations page.