A Columbia homeowner living in a historic farmhouse faced a common challenge with older properties—no central HVAC system. Instead, they relied on three split AC units to keep the home comfortable. When they opened the units for routine maintenance, they discovered heavy mold contamination inside.
They cleaned the units thoroughly, hoping that would solve the problem. Within weeks, the mold had returned—worse than before.
The homeowner knew something was wrong. Mold doesn't regrow that aggressively without an underlying issue. They reached out to Claro for testing to understand the full scope of the problem.
Air quality testing revealed elevated mold spore levels not just in the AC units, but throughout the home. The split systems had been distributing contaminated air into living spaces every time they ran. Cleaning the visible growth hadn't addressed the spores that had already spread—or the conditions allowing rapid regrowth.
Claro's team performed a comprehensive treatment of all three AC units along with a whole-home dry fog application. The EPA-certified process eliminated mold in the units themselves and neutralized airborne spores that had circulated throughout the farmhouse.
Post-treatment testing confirmed mold levels dropped to normal ranges. The aggressive regrowth stopped, and the homeowner could run their AC units without concern. Regular maintenance paired with proper treatment had finally broken the cycle.
This case shows why surface cleaning alone often isn't enough when mold has taken hold. Without addressing contamination at the source—and throughout affected spaces—the problem will keep coming back.
