HVAC and Air Duct Mold in Gettysburg, PA
The musty smell when your AC starts comes off the wet coil inside the air handler, which is a different job from cleaning the ducts. Our local mold specialist works out which one you've got, tells you whether the ducts need cleaning or replacing, and puts the price in writing.
Why Your AC Smells Musty When It Starts
Your AC smells musty when it starts because the coil inside it is wet. Any time the air conditioning runs, warm air off the rooms hits that cold coil and water forms on the fins. Dust rides in on the same air and sticks to the wet fins.
Below the coil there's a pan catching the drips, and when that pan or its drain line blocks up, the water just sits there. Mold grows on the coil and in the water, and your ducts blow the smell around the house every time the system kicks in.
When Air Duct Mold Cleaning Is Worth Paying For
Air duct mold cleaning is worth paying for in three situations, and routine maintenance isn't one of them. Clean them if you can see mold growing inside, if something has nested in there, or if dust is blowing out of the vents into the room. Those three come straight from the EPA, which doesn't recommend cleaning ducts otherwise. It also says duct cleaning has never been shown to prevent health problems.
So if someone offers it on a service call and none of the three fit your house, ask them what you're paying for.
Why Your Ducts Might Get Replaced Instead of Cleaned
Your ducts get replaced instead of cleaned when they're insulated and they've got wet. The EPA says wet insulation can't be cleaned properly, so it has to come out.
Replaced
Fiberglass duct board and fiberglass-lined metal both soak water up and hold it inside, where a brush and a vacuum can't reach.
Cleaned
Plain sheet metal doesn't absorb anything, so it cleans up fine.
The first question on any duct quote is what your ducts are made of. If you don't know, that is one of the things a visit settles before anyone prices the work.
What mold work costs in GettysburgWhat to Ask Before Anyone Sprays Your Ducts
Before anyone sprays anything into your ducts, ask what the product is registered for. The EPA has no biocide registered for fiberglass duct board or fiberglass-lined ducts. So if yours are lined, whatever they spray in there wasn't approved for it.
Sealants are the same story. The EPA says most organizations don't recommend coating over what's inside a duct. That's not the same as sealing a leak, which is a normal repair. Neither one dries the duct out, so the mold comes back. Get the product name and its registration in writing before you agree to anything.
Where Mold Turns Up in Your Ductwork
Mold turns up in your ductwork wherever a cold duct runs through warm damp air. In a Gettysburg house that's the attic, the crawl space, and any closet the runs were boxed into when central air went in. Houses built before central air had nowhere to put ducts, so they went through whatever space was spare.
In July a cold duct crossing a hot attic sweats along its whole length, and the insulation around it holds that water against the metal. A duct slung a few inches above bare dirt in a crawl space is sitting in the dampest air in the house.
Why Your Mini-Split Smells Musty
Your mini-split smells musty because it's got the same wet coil as a ducted system, just in a box on your wall instead of a closet. Dust builds up on the blower wheel behind the louvers, and the tray underneath it stays damp. The filter you slide out and rinse doesn't go near either of them.
You'll find mini-splits in converted apartments and in rooms added onto older houses, where there was no way to run ductwork in. Run the fan for a few minutes after the cooling stops and the coil dries off. A lot of units will do that themselves once you turn the setting on.
Why HVAC Mold Quotes Vary So Much
Get a price for your systemHVAC Mold Questions
Does cleaning the ducts get rid of mold in the house?
Not on its own. The EPA says if you don't fix what caused the growth, it comes back. So unless someone deals with the water at the same time, a clean buys you a season.
How do I know the black marks in my vent are mold?
You can't tell by looking, and neither can anyone else. The EPA says it can take lab analysis to know for sure. So if a company is quoting you for mold removal off a photo of your vent, they're guessing.
Do my ducts need cleaning after a flood or a burst pipe?
That depends which kind you've got. Sheet metal that got wet can be cleaned and dried out. Insulated duct that got wet has to come out, because the water's inside the material.
Get a mold removal estimate
Tell us what you've found and our local mold specialist will come back to you the same day to arrange a look. Comparing it against another quote? The cost guide shows the national ranges for the same size of job.
Call now (223) 747-0678 Mold remediation in Gettysburg and Adams County