Maryland HVAC Match
Flexible insulated HVAC ducts and an air handler unit installed in a dusty attic with a skylight.

Duct Cleaning in Gaithersburg, MD

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Step 1 of 3: Equipment
A residential attic with flexible silver HVAC ductwork connecting to an air handler unit, surrounded by blown-in fiberglass insulation and exposed wooden rafters.

Seven months of heat moves a lot of dust through your ducts

Your furnace runs October through April here, seven months of the year. On the nights that average 27°F all winter, it cycles on and off for hours at a stretch, and every cycle pushes air through the ductwork. Whatever is sitting in those ducts, dust, pet hair, fine grit, moves with that air and settles again in the bends and joints.

A duct system loaded with that buildup gives the furnace a narrower path to push air through, and it carries whatever is in there into every room the system heats.

7 months
October through April, your furnace pushes air through your ducts
4 months
June through September, your air conditioner does the same
Isometric cutaway illustration of a single-story house with a dark gabled roof, showing a ducted ventilation system connected to an air-handling unit and rooms containing sofas, a bed, and bathroom fixtures.
Your ducts carry heat October through April and cooled air June through September.

NOAA nClimDiv, 1991–2020 normals

How often should air ducts be cleaned?
There's no fixed schedule that fits every house. It comes down to what's actually built up inside, which depends on pets, remodeling, and how the house is used. A contractor can look inside the ducts and tell you whether they need attention now or can wait.
Is air duct cleaning worth it?
It depends on what's in the ducts. If they're full of dust and debris, cleaning them can help the air moving through your house and ease the load on your furnace. If they're already fairly clean, you won't notice much difference. A contractor can check before you pay for a service you may not need.
What does air duct cleaning involve?
A contractor uses a vacuum system connected to your ductwork, along with brushes or air whips, to loosen and pull dust and debris out of the supply and return lines. Registers get cleaned too, along with the grilles that cover them. On some jobs, the coil and blower housing get cleaned as well since dust collects there. The whole system gets sealed back up once the work is done so nothing leaks air along the way.
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