Why Does My Nexton Home Smell Musty?
That smell is almost always mold in the ductwork.
Why does my new Nexton home smell musty when the AC runs?
That smell is almost always mold in the ductwork. Nexton homes are new and tightly built, and tight homes hold the humidity their short AC cycles leave behind, so moisture condenses on the cold ducts and feeds mold. Treatment is $50 a vent ($399 minimum), backed by a 12-month guarantee.
Nexton, Cane Bay, and Carnes Crossroads first · Flat $50 a vent · EPA-registered antimicrobial · 12-month guarantee
The smell is mold the HVAC system pushes out through the vents. Like production homes across the country, many Nexton houses run single-stage AC: one speed, full blast until the thermostat is satisfied, then off. The air cools fast, the unit shuts down, and the humidity it never pulled out stays behind to condense on the cold ductwork and feed mold.
Nexton has grown to roughly 12,000 residents, with homes listing from the $300s to over a million dollars (nexton.com), and nearly all of it is recent, code-tight construction. The US Department of Energy found that tight, high-efficiency homes run shorter AC cycles, so “indoor moisture can build up and cause elevated levels of indoor relative humidity” (DOE Building Science, report BA-1310). In a climate that sits muggy roughly six months a year at around 72 percent relative humidity (WeatherSpark), that indoor moisture lands on the coldest surface in the house, which is your ductwork. The EPA compresses all of it into one sentence: mold control is moisture control.
So a Nexton home that is only a few years old can smell musty every time the AC kicks on. None of that is on you. The climate met the construction, and the ducts caught the moisture.
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No coupon math and no doorstep markup. Your vent count times $50 is the job.
How much does mold treatment cost in Nexton?
Most Nexton homes run 10 to 15 vents, so a complete treatment is $500 to $750 against a $399 minimum, with a 12-month guarantee. Set that against the $2,000 to $10,000 national sources quote for mold removal inside an HVAC system (HomeGuide 2026; This Old House 2026, national estimate, Charleston SC area), and early duct treatment is plainly the cheaper path, taken before mold reaches the structure.
The scope never shrinks: supply and return vents, cooling coil, drain pan, blower, and air handler, all cleaned and then coated with an EPA-registered antimicrobial by our Bactronizing electrostatic process. Nexton homes list anywhere from the $300s to over a million dollars (nexton.com), and a clean air system protects that value. The transferable certificate helps at resale too: it documents the treatment on the one system a CL100 letter leaves alone.
Most Nexton homes run 10 to 15 vents, so a complete treatment is $500 to $750 against a $399 minimum, with a 12-month guarantee.
Why are the upstairs bedrooms the worst for it?
Heat rises and humid air collects up high. In a two-story home with one downstairs thermostat, a single-stage AC runs until that downstairs sensor is satisfied, then quits, so the second floor never gets the long, slow run it needs to dry out. The upstairs can read a fine temperature and still sit damp. That damp air moves through the same duct runs, which is why the musty smell is often strongest at the bedroom and hallway vents.
We will not pretend to know which Nexton floor plans do this worst; nobody has published that. The physics is the same in any tight two-story with a single-stage system, and it is not a knock on the house: the equipment is doing exactly what it was built to do, in a climate that punishes it. Treating the duct system clears the mold the damp air has already grown, and we will tell you straight if the moisture itself needs a dehumidifier or a longer fan setting to stay ahead of it.
Who’s behind the $50 rate?
The rate is the owner’s: Greg Busang set it, posted it, and holds it. His trained crew handles the treatment itself, and a public price leaves them nothing to upsell at your door.
Nexton sits beside Cane Bay in the heart of the service area, so both communities see the earliest openings. Same construction era, same humidity, same posted number.
More on the musty-smell problem.
For the full building-science breakdown of why new homes do this, read Why does my brand-new Cane Bay home smell musty?. Right next door in Cane Bay with the same issue? See mold treatment in Cane Bay, SC. The step-by-step treatment process lives at the HVAC mold treatment hub.
Nexton questions.
Basic Info
Why does my new Nexton home smell musty when the AC runs?
The smell is mold the blower pushes out through the vents. Many production-built homes, Nexton’s included, run single-stage AC that cools fast but removes little humidity, so moisture condenses on the cold ductwork and feeds mold on the coil and duct surfaces (US Department of Energy). Treating those surfaces at the source clears it.
Can you treat mold in a new Nexton build?
Yes. A Nexton house can grow duct mold in its first or second summer, because airtight construction traps the humidity a short-cycling AC leaves behind. Treating the system early costs $50 a vent against a $399 minimum, carries a 12-month guarantee, and keeps the problem out of the structure.
Service Info
Why are the upstairs bedrooms in my Nexton home so muggy?
In many two-story homes, a single-stage AC runs until the downstairs thermostat is satisfied, then shuts off, so the upstairs never gets a long, slow run to dry out. Humid air collects up high and moves through the same ducts, which is why the musty smell often reads strongest at the bedroom vents. Treating the duct system clears what that damp air has grown.
How much does mold treatment cost in Nexton?
A flat $50 per vent, $399 minimum. A 10 to 15 vent Nexton home works out to $500 to $750 for the whole system, backed for 12 months. The vent count gets verified at the door, and the posted rate is what lands on the invoice.
Book your Nexton treatment.
Grab a weekday slot between 8 and 4, or a Saturday morning. Booking is free and there is no deposit.