Why coils grow mold in Florida
The evaporator coil is the coldest, wettest surface in your HVAC system — condensation forms on it every time the AC runs. In Florida's humidity, that constant moisture plus organic dust makes the coil a near-perfect breeding ground for mold and bacterial slime. That biofilm is the source of the classic "dirty sock" smell, and it recirculates through the whole house.
What a UV light does about it
A germicidal UV-C lamp mounted at the coil runs whenever the system is on, continuously breaking down the DNA of mold spores and bacteria so they can't reproduce or establish a colony. Independent testing shows UV-C can cut coil biofilm by up to 99.9%, which both clears the odor and keeps the coil operating at its designed efficiency.
Pure Breathe UV systems are quoted free at your home, since the right lamp depends on your coil and air handler — there's no obligation. Operating cost is only a few dollars a year in electricity, and Hales Comfort Club members save 20% on installed systems.
When it makes the most sense
A UV light is most valuable right after a duct cleaning — it keeps the freshly cleaned coil from re-growing biofilm within months, which is exactly what Florida's climate would otherwise do. It's also a strong choice for homes with recurring musty odors, allergy sufferers, or anyone who wants to protect the coil long-term. Lamps need replacing about every three years.