In humid East Texas, nearly every musty-smell call comes back to one of these six moisture problems.
Your AC pulls gallons of water out of humid East Texas air every day. When algae plugs the drain line, water sits in the pan under the coil and starts to smell like a damp basement within days.
The indoor coil stays cold and wet all cooling season. Dust stuck to that wet surface feeds mildew growth, and every cycle blows that smell straight through the vents.
A filter packed with dust and pet hair holds moisture and grows odor quickly, especially in attic and closet air handlers. It is the cheapest cause to rule out.
A unit that is too big cools the house fast and shuts off before it removes humidity. The house feels cold and clammy, and damp air plus a wet coil is exactly what mildew needs.
Return ducts with gaps pull hot, wet attic or crawlspace air into the system. That air carries the musty smell with it and leaves condensation inside the duct.
A rusted drain pan or a sagging duct run can hold water where you cannot see it. We find it with a camera and a moisture meter, not by guessing.
All three are safe to do yourself.
A burning, electrical or rotten-egg smell is different — turn the system off and call us right away.
Many Edgewood homes along FM 2965 and FM 859 are older farmhouses with the air handler in an unconditioned attic and a long condensate line. Those long drain runs clog more easily, and a slow drain is the first thing we check when an Edgewood homeowner calls about a damp or mildew smell.
Edgewood gets same-day service from our Van Zandt County routes, so we can usually clear the drain and clean the coil on the first visit.
Canton's historic in-town homes often have older duct systems with leaky returns that pull damp air from crawlspaces and attics. Shops and rental cabins near First Monday Trade Days that sit closed between events also build up odor in the drain pan.
Canton is about 18 miles from our Eustace shop, so most calls get a technician at the door quickly.
Musty smells often travel with other moisture problems. Leaky ducts, high indoor humidity and weak cooling are all related, and fixing the cause usually helps all of them.
Tell us your city and what you are smelling, and we will schedule a technician. Faster still? Call (903) 479-3015.
Almost always moisture. The most common causes are a clogged condensate drain, mildew growing on the wet evaporator coil, a dirty filter, or ducts pulling in damp attic air. The smell is strongest in the first few minutes of each cycle because the system is blowing air across wet surfaces that sat still.
It is a sign of mold or mildew growth somewhere in the system, which can bother people with allergies or asthma. It is not an emergency like a burning or gas smell, but it should be cleaned out rather than covered up with air fresheners.
Replace the air filter, look at the drain pan under the indoor unit for standing water, and check that the drain line is dripping outside while the system runs. If the smell stays after a new filter and a clear drain, the coil or ducts need a technician.
We clear and flush the condensate drain, clean the evaporator coil and drain pan, replace the filter, and check the ducts for leaks or trapped moisture. If the system is oversized and short-cycling, we talk through humidity control options so the smell does not come back.
Humidity. Long, muggy cooling seasons mean the coil is wet for months, and many homes around Canton and Edgewood have air handlers in hot attics where moisture problems grow fast.
After the source is cleaned, yes. A whole-home dehumidifier or UV light on the coil can help keep mildew from returning. See our indoor air quality page for the options we install.
Yes — Trane, Carrier, Lennox, Goodman, Rheem, York and the rest. Drain, coil and duct moisture problems are handled the same way on any brand.