Duct Cleaning in Baltimore, MD
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Step 1 of 3: Equipment
Seven months of heating pushes the same air through your ducts
Baltimore homes need heat from October through April, seven months of the year. That is seven months of furnace air moving through the same ductwork, carrying dust and pet hair into the return and pushing it back out into every room.
Winter nights here average 28°F from December through February, so the furnace is cycling on and off most nights of the season. Every cycle pulls more air, and whatever has settled in the ducts, through the system again. None of it clears out on its own. It sits in the ducts until someone cleans them.
- 7 months
- October through April, your furnace pushes air through your ducts
- 4 months
- June through September, your air conditioner does the same
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NOAA nClimDiv, 1991–2020 normals
- How often should air ducts be cleaned?
- There is no fixed number of years that fits every home. What matters more is what is actually going on inside the ducts, so a contractor can look with a camera and tell you if there is real buildup. Homes with pets, a recent renovation, or someone with allergies tend to need a look sooner since more gets pulled into the return air. If dust keeps settling around the vent covers no matter how often you wipe it down, that is worth having checked.
- Is air duct cleaning worth it?
- It is worth it if your ducts actually have a buildup of dust, debris, or signs of rodents or mold, not on a fixed schedule alone. A contractor can look inside the ducts with a camera and tell you what is actually in there before you pay for a cleaning you may not need. Dust that keeps settling on furniture right after you clean, or a musty smell when the system kicks on, are the kind of signs worth having checked.
- What does air duct cleaning involve?
- A contractor connects a vacuum to the duct system and uses brushes or air tools to knock loose dust and debris from the inside walls of the ducts, then pulls it all out through the vacuum. This covers the supply and return ducts, the grilles and registers, and usually the coil and blower housing where dust collects too. The furnace filter gets replaced as part of the job since a clean duct system feeding through a dirty filter defeats the purpose.