What do UV lights do in an HVAC system?

HVAC UV lights use ultraviolet-C energy to damage the DNA of microorganisms on surfaces or in the air stream. In a home system, they are mainly used to keep the evaporator coil and drain area cleaner, not to replace filtration or humidity control.

Do UV lights kill mold in ductwork?

They can reduce microbial growth on surfaces that the light actually reaches, especially on a coil or drain pan. They do not clean every inch of ductwork, and they will not fix a moisture problem that keeps feeding mold growth.

Are UV lights worth it in a Pittsburgh home?

They make sense in homes with damp basements, recurring coil slime, musty odors from the air handler, or drainage issues that keep coming back. If the real problem is bad filtration, a clogged drain, or high indoor humidity, those issues need to be solved first.

How often do HVAC UV bulbs need to be replaced?

Most UV bulbs need replacement about once a year, even if they still light up. The bulb can keep glowing while its germicidal output drops, so annual replacement is the safe rule of thumb.

UV Lights in Pittsburgh HVAC Systems: What They Do and When They’re Worth It

Pittsburgh homes are great at collecting the kind of indoor air quality problems that keep HVAC techs busy. You get humid summers, damp basements, old ductwork, and air handlers that spend half their lives growing a little science project on the coil if nobody is paying attention.

That is where UV lights come up. A properly installed UV-C light can help keep the evaporator coil and drain pan cleaner, and that matters because a wet coil is exactly where mildew and slime like to settle in. But UV is not a catch-all fix, and a lot of homeowners get sold the fantasy version of it instead of the real one.

UV Lights in Pittsburgh HVAC Systems: What They Do and When They’re Worth It

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