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Video · AC Maintenance and Coil Cleaning

Dirty Evaporator Coil and Blower Wheel: Where AC Dust Ends Up

Dust that gets past your filter lands on the blower wheel and the evaporator coil, the cold coil above the furnace. That coil is wet while the AC runs, so it catches dust like flypaper and slowly chokes airflow.

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Licensed and insuredVirginia Class A contractor #2705192276

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What you’re seeing in this video

A tech in a black cap and hoodie reaches into the cabinet that sits on top of the furnace in a mechanical room. A label on screen names it: the evaporator coil, the indoor half of your air conditioner.

Then comes a close-up of a blower wheel, the squirrel-cage fan that moves air through the whole system, with dust caked along its curved blades. Dust on those blades cuts how much air the fan can move.

Job footageSwiftPro
Topic
AC Maintenance and Coil Cleaning
Length
0:28
Posted
September 11, 2026
Shot by
The SwiftPro crew, Northern Virginia

Why it matters in your house

  • A dirty evaporator coil cuts airflow and can freeze up in summer. If you see ice on the copper lines or water pooling around the furnace, shut the AC off and call.
  • The coil's drain pan collects the dust that washes off with condensation. That sludge is what clogs drain lines and sends water through a ceiling or onto a basement floor.
  • Filter fit matters as much as filter rating. A snug filter changed on schedule is the cheapest way to keep this coil and the blower wheel clean.

How do I know if my evaporator coil is dirty?

You usually can't see it without opening the cabinet, so watch for symptoms: weaker airflow from the vents, the AC running longer, ice on the refrigerant lines, or water near the furnace. A tech can look at the coil face through an access panel or with a camera and tell you whether it needs cleaning.

Want it done at your place? See AC Maintenance and Coil Cleaning at SwiftPro or call (703) 997-9757.

More videos from the SwiftPro crew

A tech in a gray Trane hoodie and black SwiftPro cap tests a condenser capacitor with a clamp meter at a row of AC condensers outside townhomes in the rain.0:30AC Condenser Inspection: Testing the Capacitor and PressuresClose-up of an AC condenser's insides: capacitor, wiring, filter drier and service valve.0:28AC Condenser Parts: Compressor, Coil, Capacitor and the RestHands in maroon sleeves wipe rust-red dust off a bundle of control wires with a rag inside an air handler or furnace cabinet.0:26Cleaning Inside an AC Unit Means Cleaning the Wires TooA tech pulls the media filter from an Aprilaire filter cabinet on a gas furnace in a laundry room.0:38AC Maintenance Before Summer: Filter Inside, Wiring OutsideA young tech in a black SwiftPro polo stands beside an AC condenser in a backyard holding a tablet and explains how dirty AC coils raise costs on a 15-year-old unit.0:39Dirty Condenser Coil: Still Cooling, Still Doing DamageOutdoor AC condenser cleaning: leaves and mulch packed inside the base, then a tech in black with red gloves sprays foaming coil cleaner and rinses the coil with a hose beside a brick house.0:29AC Coil Cleaning, Start to Finish: Leaves, Foam and a Rinse

See all 234 SwiftPro videos

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SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276

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