Contact Us







    (800) 482-8224

    What is Dirty Sock Syndrome and How Can You Avoid It ?

    What is “Dirty Sock Syndrome”? Dirty Sock Syndrome is caused by bacteria growing on HVAC system coils, and refers to the unpleasant odor that comes from your residential or commercial heat pump coils.

    ACHR News (Air Conditioning | Heating | Refrigeration) links DSS to these three main causes:

    “Cooling coils and other AC components are not made in sterile environments, meaning that microbes cover all of their parts along with a small amount of lubricant.”

    “During the first cooling event after installation, condensate brings life to the microbes, which initially use the lubricant as an initial food source.” Microbial decay (better known as “rot”) is the culprit of the foul stench that smells like a dirty sock.

    Did you know? According to ASHRAE coil cleaning can save 10-25% of operation costs!

    During certain times of the year when a heat pump may warm in the morning hours and then cool at noon and/or later hours, the system can produce condensate from noon onward, fueling growth for up to 16 hours – only to release odors and toxins during the next morning’s warming hours. Heat pump coil temperatures are often not sufficient to kill proliferating microbes. Those that may die simply serve as a future food source for continued proliferation.

    How Can You Get Rid of Dirty Sock Syndrome?

    The best way to get rid of the musky aroma is by thoroughly cleaning the coils in the HVAC system.

    Our first step is always to schedule an on-site visit to take a look at the setup and size of the air handler unit. We also take this opportunity to check for any visible mold growth in the ductwork.

    The second step is the “full system and evaporator coil cleaning, which involves: flushing the coils, determining the cause of the syndrome, as well as the cleaning and/or applying a sealant.

    How Can You Avoid Dirty Sock Syndrome in the Future?


    The best way to avoid dirty sock syndrome from occurring in the first place is to ensure that your HVAC system is serviced on a regular basis. After all, a good offense is always the best defense – even if the syndrome has already occurred, a thorough cleaning can prevent the problem from happening again.

    Call 800-482-8224 to schedule an appointment with an Amazon Air Duct Cleaning Professional today!

    author avatar
    amazonairpro
    27 August, 2021
    Technician inspecting residential gas fireplace vent 7 October, 2026
    Homeowners: Why Gas Fireplaces Need Annual Chimney Inspections

    NFPA and CPSC recommend annual inspections for gas fireplaces. See common vent failures, CO risks, DIY checks homeowners can do, and when to call a pro.

    Technician inspecting shielded HVAC UV-C lamp 6 October, 2026
    Homeowners: ASHRAE Guidance for Safe HVAC UV Light Installations

    Safety first HVAC UV light installation for homeowners. Step by step checklist, ASHRAE and NADCA guidance, wiring and interlock tips, and annual bulb…

    Open HVAC duct with rodent droppings 5 October, 2026
    Ventilate 30 Minutes First: NY/NJ/CT Rodent Droppings in Ducts

    Local duct-cleaning pros offer a safety-first plan: ventilate 30 minutes, follow EPA and CDC cleanup steps, call pest control first, then hire full-system…

    Technician verifying school duct condition 4 October, 2026
    NY/NJ/CT Facility Managers: School Duct Cleaning RFP & Verification

    Inspection first checklist for NY/NJ/CT facilities. Turn EPA, ASHRAE and NADCA findings into RFP specs, verification tests, and next steps.

    Technician inspecting ash inside pellet stove vent 8 October, 2026
    Prevent CO Leaks: Pellet Stove Chimney Cleaning for NY/NJ/CT Homeowners

    Protect your home from CO and blocked vents. Step by step pellet stove chimney cleaning, safety checks, and when to call a pro in NY, NJ, and CT.

    Technician inspecting residential gas fireplace vent 7 October, 2026
    Homeowners: Why Gas Fireplaces Need Annual Chimney Inspections

    NFPA and CPSC recommend annual inspections for gas fireplaces. See common vent failures, CO risks, DIY checks homeowners can do, and when to call a pro.

    Technician inspecting shielded HVAC UV-C lamp 6 October, 2026
    Homeowners: ASHRAE Guidance for Safe HVAC UV Light Installations

    Safety first HVAC UV light installation for homeowners. Step by step checklist, ASHRAE and NADCA guidance, wiring and interlock tips, and annual bulb…

    Open HVAC duct with rodent droppings 5 October, 2026
    Ventilate 30 Minutes First: NY/NJ/CT Rodent Droppings in Ducts

    Local duct-cleaning pros offer a safety-first plan: ventilate 30 minutes, follow EPA and CDC cleanup steps, call pest control first, then hire full-system…

    Technician verifying school duct condition 4 October, 2026
    NY/NJ/CT Facility Managers: School Duct Cleaning RFP & Verification

    Inspection first checklist for NY/NJ/CT facilities. Turn EPA, ASHRAE and NADCA findings into RFP specs, verification tests, and next steps.