Our air-handler has a UV bulb inside installed by original owner that goes on when system is running. I replaced the bulb recently when checking out the inside of the air-handler since it (the bulb) was probably over 10 years old but was still working. Question is, does that UV bulb really serve any useful purpose in the air handler ? I understand what it is SUPPOSED to do but not sure it really helps. Reading online it says "UV lights kill microbes, mold spores and viruses in air-handlers" but generally in relation to hospitals. Never heard much discussion about their usefulness in home systems. Everything I read about them is from some company who sells them.
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