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Thread: Residential UV lights are worthless and potentially hazardous - Change my mind

  1. #1
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    Residential UV lights are worthless and potentially hazardous - Change my mind

    From what I've read and heard on podcasts, residential UV lights do not kill CV-19. I have seen them degrade air filters and the casing on wiring. I have concerns about ozone production even though the new lights claim "no ozone."
    I consider the big 3 for IAQ to be filtration, ventilation, and humidity control.

    Let the debate commence.
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  3. #2
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    I know not a lot of testing has been done. UV light has been known to kill many things. Sunlight UV-A if exposed long enough has shown to kill other viruses in the Covid Family. UV-B has been shown to help different skin conditions. UV-C has shown like UV-A that it kills most virus and bacteria, it's more potent and takes shorter exposure. There are many chemical's that kill Covid 19 and other Covid type virus So it is not a big leap to believe that UV-C will kill Covid-19, the question is how much exposure is needed. I would think it would be easy enough to test and see. I have heard all the guys with big brains that would do this testing have been too busy fighting Covid in trenches to do the testing for UV light. While I don't think it's worthless, I question a single virus (spore/molecule) exposed to UV-A or UV-C for a second is enough to kill it

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  5. #3
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    I attended a talk by ASHRAE on Covid mitigation strategies a few months ago. My understanding is that in-duct UV lamps are ineffective against Covid. As I recall this is for two reasons - the velocity of the virus going past the lamps and also the fact that a lot of the virus spores are wrapped in dust making the UV ineffective against them.

    So yes they are probable not worth installing as a protection against Covid.

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  7. #4
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    To say they are worthless is a bit of an overstatement but if you single out use on Covid 19 I have no argument at this time.

    i have been installing UV lights for years. I agree that care must be taken as to where they are located as they do cause some plastics to deteriorate. I have one that I use as a trial for people so they can see if it cures the issues they are having without the expense of purchasing one only to find out it did not work. My unscientific conclusion is that about 60-70% of the time they help. I find it interesting that often times I go back to retrieve the unit and they say it didn't help only to have them call a few weeks later saying they want one. Like all things it is not a one size fits all application and should be treated as such in that it will only help some and not all with the data we have now.

    The worst part is there will be dealers that will push the UV lamps and the 'Air Scrubber" type devices playing on peoples fear of a virus only as a profit center not an actual fix for anything.

  8. #5
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    Quote Originally Posted by BNME8EZ View Post
    To say they are worthless is a bit of an overstatement but if you single out use on Covid 19 I have no argument at this time.

    i have been installing UV lights for years. I agree that care must be taken as to where they are located as they do cause some plastics to deteriorate. I have one that I use as a trial for people so they can see if it cures the issues they are having without the expense of purchasing one only to find out it did not work. My unscientific conclusion is that about 60-70% of the time they help. I find it interesting that often times I go back to retrieve the unit and they say it didn't help only to have them call a few weeks later saying they want one. Like all things it is not a one size fits all application and should be treated as such in that it will only help some and not all with the data we have now.

    The worst part is there will be dealers that will push the UV lamps and the 'Air Scrubber" type devices playing on peoples fear of a virus only as a profit center not an actual fix for anything.
    Air scrubber CLAIMS covid results.

    specifically the hydroxyl blaster, but it uses a hepa filtration system in combination.

    The idea being the hepa catches the junk, the UV kills it.
    Read the fine print, specifically the laboratory testing.

    I've had success with PCO products.
    I've also had people hate them.

    The biggest problem is the cost benefit doesn't make sense.

    People are willing to pay X for it, but it costs 2X, forcing salesmen to come up with added value to meet the cost.
    Which is where people get burnt.

  9. #6
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    We're selling i Waves like crazy. Whatchu boys think about it?

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  11. #7
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    Issues like optimum oxygen levels, minimal pollution levels, medium %RH, and comfort levels important issues Indoor air should be clean and free of mold spores and allergens. These issues are important now and long after COViD is a memory.

    Oh, do not forget Vitamin D3.

    People are buying equipment but not sure what really works.

    Regards Teddy Bear
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

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