Duct Cleaning in Dover, NH
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Eight months of heating pushes air through ducts that rarely get a break
Your furnace runs October through May here, eight months of the year. That's eight months of air moving through the same ducts, carrying dust and whatever settles in the return side of the system. On nights averaging 16°F, the furnace cycles on and off for hours at a stretch, and every cycle pushes more air through.
Strafford County has seen 44 winter storms and 43 damaging wind events over the past ten years, and close to a quarter of New Hampshire households lost power for a full day or more in 2024. When the power drops and the furnace stops, dust that was moving through the ducts settles instead. When it comes back on, that first cycle stirs it back up into the house.
- 8 months
- October through May, your furnace pushes air through your ducts
- 2 months
- July through August, your air conditioner does the same
NOAA nClimDiv, 1991–2020 normals
- How often should air ducts be cleaned?
- There's no fixed schedule that fits every house. Homes with pets, a recent renovation, or someone with allergies usually need it sooner than others. Your furnace runs eight months of the year here, October through May, so dust and pet hair move through the system more than they would somewhere with a shorter heating season. A contractor can look inside your ducts and tell you if it's time.
- Is air duct cleaning worth it?
- It's worth it if your ducts are visibly dirty, you've had rodents or a water leak, or dust keeps settling right after you clean. It won't lower your heating bill or fix an allergy on its own. A contractor can look inside the ducts and tell you whether cleaning will actually help your situation.
- What does air duct cleaning involve?
- A contractor connects a vacuum to your duct system and uses brushes or air tools to knock loose dust and debris, then pulls it out through the vacuum before it resettles. They'll also clean the supply and return vents, and check the coil and blower if those are part of the job. The furnace filter is a separate part and gets replaced, not cleaned.