UV lights. Fact or fiction?

[jpsmith1cm]

Was just reading about these a little in the most recent issue of RSES journal.

I have exactly ZERO experience with them.

Are they really as good as they are claiming?

Do they significantly reduce airborne micro-organisms?

The reason that I ask is that my wife has serious breathing issues and something that may help to prevent the spread of illness would be a good investment.

Thanks in advance to all.

[dash]

They make a difference.

They can't traet all the air as it typically moves to fast,unless installing several over several feet of duct.

They keep the coil very clean and the area around it,when installed on the discharge side of the coil,If they are bulbs that produce significant UVC in the cold air discharge.


Search the IAQ section here for more.

[Some Dude]

This isnt going to end well, wait until the indoor air guys get here.:eek2:

[classical]

Unless things have changed drastically in the last year there is no empirical evidence that shows a reduction of airborne contaminants with the use of "UV" lights.

In order to kill most common airborne viruses or bacteria there must be a minimum of 41 seconds direct exposure to the "UV" light. That cannot happen at 500 FPM.

A "UVC" light will kill what is present on an evaporator coil when it is bathed in the light. There are other filtration systems that do an admirable job but each only has a narrow scope of benefit. The Carrier/Bryant Purifier does capture and kills bacteria according to their test, the Trane/AmStd Clean effects does its think cannot remember precisely what, and the Lennox Pureair does a very good job of reducing odor.

The best thing you can do is assure your duct system is tight and clean, you have adequate return capacity and a good MERV 11 or better extended media filter. Ensure the coil is clean and remains so with the filter. Additionally maintaining the humidity below 50% with a reasonable dew point 55 degrees or less will prevent dust mites from prospering/propagating and most people’s breathing difficulties are exacerbated or even caused by dust mites.

[JJDH]

Get a duct cleaning.

[classical]

Get a duct cleaning.

Wrong!!!

[Some Dude]

Wrong!!!

Agreed, you would be better off cleaning it yourself with a shop vac set outside and a long hose.

[jpsmith1cm]

I will be installing new this spring.

I removed the old one after what I estimate to be over 30 years of service.

Amazingly, I could see through the coil. It had either been cleaned shortly before I bought the house, or the filtration system is awesome.

I am running an Aprilaire 20x25x4 filter and I replace it as needed.

My wife has a condition called Alpha1 Antitrypsin Deficiency. It is an autoimmune disorder that causes her respiritory problems and weakens her immune system somewhat.

Obviously, anything that I can DO to help her is well worth the investment, but I want to be sure of it before pulling the trigger.

[energy_rater_La]

Thank you Classical.
Almost word for word what I have been saying for years.
Seal the duct sytem tightly along with all ceiling boots
and return air.
Use good filters, change regularly, add dehumidifier when/where
needed.
best of luck OP

[jpsmith1cm]

Thank you Classical.
Almost word for word what I have been saying for years.
Seal the duct sytem tightly along with all ceiling boots
and return air.
Use good filters, change regularly, add dehumidifier when/where
needed.
best of luck OP

Ok. Is it worth is to install a dehumidifier as part of an overall IAQ strategy?

Believe me, for the coin that I am throwing down on medical bills annually, even having this stuff professionally done would be a bargain. :eek2:

[skippedover]

No amount of knowledge can allow anyone who has neither seen nor tested your home and ducted system to make any sort of accurate determination as to what IAQ items might be of benefit to you. You asked about UV lights and received various responses but I saw none that actually addressed the real issue of UV lights. That being the actual OUTPUT of each model. Many UV lights produce only about 40-watts or less and are very ineffective beyond about 4-inches of the bulb. Since the bulb is normally only between 14 and 16 inches in the length and about 1-inch in diameter, clearly a low wattage UV light is of limited or no use. Howver, there are UV lights out there that produce in excess of 150-watts and are able to do a superior job over a wider area. Someone mentioned a Merv 11 filter. That's a great number if you know all the ins and outs of Merv ratings and filtration. First, Merv is a rating that is given to a dumb filter (I use the term 'dumb' because all they do is sit there and catch what comes by.) All basic filters have a Merv rating. You can look up the different levels of Merv on the internet to be somewhat better educated. However, a high Merv rating alone does not guarantee satisfaction. In fact, there is none very high Merv rated, pleated air filterl on the market that all but stops the blower entirely due to its restrictive construction. It has a very high static drop (resistance to airflow) to begin with and it only gets worse as it front loads (the dirt builds on the leading or upwind side of the filter) quickly and the static goes through the roof. On the other hand, some of the 4-inch pleated filters have very low static loss and do a good job of filtration. Infortunately, due to the pleats, a UV light inherently can't do a good job of 'killing' in concert with that type of filter, if the UV light is in the return.

In reality, you most likely need multiple UV lights to do the job properly. Again, they should have a high wattage and ideally a life of over 10,000 hours. If I had a medical situation in my home, I would have UV lighta at the indoor coil, one before it and one after it. I would have a good quality, easy to maintain, electronic air cleaner and just before that EAC I'd have another UV light. If my home suffered from high humidity with no need for cooling, the I would invest in a whole house dehumidifier. But if I do need cooling, then I'd invest and a properly sized, designed and installed system. If I had a favorite room that needed special attention, I'd have a high quality mini-split that has dehumidification modes built right in. And as others have already stated, a quality duct system is nearly leak free on both the supply and the return and it should be pristine sheet metal.

[dash]

Unless things have changed drastically in the last year there is no empirical evidence that shows a reduction of airborne contaminants with the use of "UV" lights.

In order to kill most common airborne viruses or bacteria there must be a minimum of 41 seconds direct exposure to the "UV" light. That cannot happen at 500 FPM.

A "UVC" light will kill what is present on an evaporator coil when it is bathed in the light. There are other filtration systems that do an admirable job but each only has a narrow scope of benefit. The Carrier/Bryant Purifier does capture and kills bacteria according to their test, the Trane/AmStd Clean effects does its think cannot remember precisely what, and the Lennox Pureair does a very good job of reducing odor.

The best thing you can do is assure your duct system is tight and clean, you have adequate return capacity and a good MERV 11 or better extended media filter. Ensure the coil is clean and remains so with the filter. Additionally maintaining the humidity below 50% with a reasonable dew point 55 degrees or less will prevent dust mites from prospering/propagating and most people’s breathing difficulties are exacerbated or even caused by dust mites.

What if we intelligently wire the fan to run on the lowest speed,on the off cycle,or have a system that comes with that capability.

[effdee]

The place I work sells these instead of the uv light. I am going to put one in my house sometime soon as
my wife has allergy and sinus problems and hope this will help her.
It sounds good and they say nothing but good things about it at work.


http://www.rgf.com/product_detail.cfm?ProductID=GA-HVAC

[BURL-REF]

On a remodel I did, I sold 2 dual lamp UV setup's. One for each furnace. The school aged kids living there were always sick during the winter. After the first year I was told the kids were not sick at all during winter. I would say they work. The deal is to select how many output watts, and running the fan continuosly would get the most out of them.
This is my only experience installing these, but wouldnt hesitate to do more installs.

[commerce48]

My wife has a condition called Alpha1 Antitrypsin Deficiency. It is an autoimmune disorder that causes her respiritory problems and weakens her immune system somewhat.

Obviously, anything that I can DO to help her is well worth the investment, but I want to be sure of it before pulling the trigger.

I would talk first to her physician if any investment in air quality will help her. I'm only a nurse, but I don't think air quality improvements will impact someone with her condition any more than you or I.

[bigjohnsons34]

I've installed these from time to time, and I'll tell you they are the best money makers out there. You can make great money on the install, it takes a matter of minutes to install, and you'll never get any call backs, because the homeowner can't really tell if they are working or not..... In my opinion they are not worth it.

[classical]

I've installed these from time to time, and I'll tell you they are the best money makers out there. You can make great money on the install, it takes a matter of minutes to install, and you'll never get any call backs, because the homeowner can't really tell if they are working or not..... In my opinion they are not worth it.

This is exactly why most techs sell these things not because they work.

[classical]

I will be installing new this spring.

I removed the old one after what I estimate to be over 30 years of service.

Amazingly, I could see through the coil. It had either been cleaned shortly before I bought the house, or the filtration system is awesome.

I am running an Aprilaire 20x25x4 filter and I replace it as needed.

My wife has a condition called Alpha1 Antitrypsin Deficiency. It is an autoimmune disorder that causes her respiritory problems and weakens her immune system somewhat.

Obviously, anything that I can DO to help her is well worth the investment, but I want to be sure of it before pulling the trigger.

I would speak with her Doctor he may be able to write a script and your insurance will pay for much of the work. The Bryant/Evolution unit with a variable speed furnace is the best product for stopping bacteria and viruses.

JP where do you live, is it a humid environment.

[classical]

What if we intelligently wire the fan to run on the lowest speed,on the off cycle,or have a system that comes with that capability.

Unless you can stop all the air for at least 41 or more seconds a "UV" light is not going to kill anything. The Purifier will capture and kill but it is not just a "UV" light.

[classical]

The place I work sells these instead of the uv light. I am going to put one in my house sometime soon as
my wife has allergy and sinus problems and hope this will help her.
It sounds good and they say nothing but good things about it at work.


http://www.rgf.com/product_detail.cfm?ProductID=GA-HVAC

That is a very interesting product I will need to do some study on it. I believe in empirical data not hype or anecdotal evidence.

[classical]

On a remodel I did, I sold 2 dual lamp UV setup's. One for each furnace. The school aged kids living there were always sick during the winter. After the first year I was told the kids were not sick at all during winter. I would say they work. The deal is to select how many output watts, and running the fan continuosly would get the most out of them.
This is my only experience installing these, but wouldnt hesitate to do more installs.

Purely anecdotal not real proof they made a difference.

[chilliwilly]

Is an ozone generator an option? The firm I work for are in partnership with a company that build their own units, and they're interfaced to washing machines to kill bacteria at lower wash temperatures. And the system has also been tested and certified by several labs throughout the UK.

The last I heard they were developing an air disinfectant system based on their ozone system (Opura). It will kill bacteria but they're not cheap.
Maybe it could be developed further to be interfaced to ducting to kill all the bacteria, or at least keep it to a minimum. Not as straight forward as UV lamps but more effective and maybe the future for packaged aircon.

[toptech]

Is an ozone generator an option? The firm I work for are in partnership with a company that build their own units, and they're interfaced to washing machines to kill bacteria at lower wash temperatures. And the system has also been tested and certified by several labs throughout the UK.

The last I heard they were developing an air disinfectant system based on their ozone system (Opura). It will kill bacteria but they're not cheap.
Maybe it could be developed further to be interfaced to ducting to kill all the bacteria, or at least keep it to a minimum. Not as straight forward as UV lamps but more effective and maybe the future for packaged aircon.

Now your talking! I own a product called Living Air.
Its a desktop console unit that will treat up too 2500 sq feet
It features a uv light and a high voltage do hicky plate, along with a 4 speed fan.
By design it generates Ozone and other science like thingy's that I dont care about and cant explain. can be set to match the Sq Fottage of your home.
What i can tell is odors and bateria\viruses cannot survive or thrive in our home.
Bad news is if you have a gas leak you wont smell it!!!
I can send you a link via email if you want to read about this baby!
PS it has a remote

[jpsmith1cm]

I would talk first to her physician if any investment in air quality will help her. I'm only a nurse, but I don't think air quality improvements will impact someone with her condition any more than you or I.

This is my plan. She has an appointment with her Pulmonologist in a few weeks, and I will send the RSES article with her so that he can look at it.

This UV technology, as I understand from reading this article, is used in operating rooms and other medical situations.

I'm just a bit sceptical of what I read in RSES Journal anymore as more and more paid ads are being disguised as 'articles'.

[classical]

This is my plan. She has an appointment with her Pulmonologist in a few weeks, and I will send the RSES article with her so that he can look at it.

This UV technology, as I understand from reading this article, is used in operating rooms and other medical situations.

I'm just a bit sceptical of what I read in RSES Journal anymore as more and more paid ads are being disguised as 'articles'.

Yes "UV" lighting is used in hospitals for many situations but it is used as an irradiation device not to improve air quality. Well maybe I will rephrase that it is not used to affect the air quality through airflow. Lights are used directly on coils to kill mold mildew and bacteria spores and they are used to bathe surface areas where bacteria and viruses can grow. It is used in hoods where microbiology work is performed or surgical instruments are used.

You should also be careful of ozone generators they can be harmful to your wife’s health. Many people have sensitivities to Ozone which can be severe or even life threatening, if you use and Ozone generator look for one that has a monitor that registers ppb of O3. This means a commercial grade unit and expense.

[lane]

Maybe install two new systems, with all metal ducts "insulation on the outside"? Install a uv light in one? Go back in 6 months and look inside the plenums and ductwork?

Lane

[commerce48]

This is my plan. She has an appointment with her Pulmonologist in a few weeks, and I will send the RSES article with her so that he can look at it.

This UV technology, as I understand from reading this article, is used in operating rooms and other medical situations.

I'm just a bit sceptical of what I read in RSES Journal anymore as more and more paid ads are being disguised as 'articles'.

The only place I know UV lights are used in hospital settings are in operating rooms for total joint replacements. For such cases, an infection is disastrous as the immune system basically cannot mount a defense inside the joint capsule. That said, most hospitals do not use UV lights even for these surgeries as there is little evidence that they make a difference on outcomes.

Your heart is in the right place, but your logic is flawed. Sure, it sounds like reducing bacterial load is a good thing, but your wife's immune system is not actually impaired for infection defense. Your money is probably better spent on other quality of life measures.

Just out of curiosity, what exactly did the RSES article say?

[Airmechanical]

do a search, we have discussed this b4 several times

the short version, i had one, and it worked!



.

[tedkidd]

I've installed these from time to time, and I'll tell you they are the best money makers out there. You can make great money on the install, it takes a matter of minutes to install, and you'll never get any call backs, because the homeowner can't really tell if they are working or not..... In my opinion they are not worth it.

Ha! "Less weight in your pocket will make you feel better".

seal ducts, spend the money on better filtration, possibly add hepa and hrv/erv.

(and don't forget a smaller furnace will make Johnson look bigger!!)

[dash]

I think you'll find that various "bad stuff" has different exposure times.They are effective ,rated, at one meter (some brands) from the bulb,so 2 meters is covered by one bulb.

Not saying that it can treat the air with just one light.


We mount them over the indoor coil,we see that after years the coil doesn't need cleaning. They say it prevents biofilm on the coil where bad stuff can grow.

[jpsmith1cm]

The only place I know UV lights are used in hospital settings are in operating rooms for total joint replacements. For such cases, an infection is disastrous as the immune system basically cannot mount a defense inside the joint capsule. That said, most hospitals do not use UV lights even for these surgeries as there is little evidence that they make a difference on outcomes.

Your heart is in the right place, but your logic is flawed. Sure, it sounds like reducing bacterial load is a good thing, but your wife's immune system is not actually impaired for infection defense. Your money is probably better spent on other quality of life measures.

Just out of curiosity, what exactly did the RSES article say?

http://www.rses.org/rsesjournal/article.aspx?ArticleId=2007

There is the web version of the article.

As far as my wife's immune system, friend, you don't live here. What gives me a one day cough and sniffle knocks her flat for a week and a half, sends her to the ER, and to the doctor's office multiple times.

[classical]

I think you'll find that various "bad stuff" has different exposure times.They are effective ,rated, at one meter (some brands) from the bulb,so 2 meters is covered by one bulb.

Not saying that it can treat the air with just one light.


We mount them over the indoor coil,we see that after years the coil doesn't need cleaning. They say it prevents biofilm on the coil where bad stuff can grow.
Dash I install an extended media filter on almost every system I install including my own. I have yet to find one that the coil needed cleaning even after 15 years.

I still have never seen any empirical study that shows that "UV" lights in anyway affect air quality. If you have an independent study that shows otherwise please provide it. I am always on the prod for new information.

[dash]

Dash I install an extended media filter on almost every system I install including my own. I have yet to find one that the coil needed cleaning even after 15 years.

I still have never seen any empirical study that shows that "UV" lights in anyway affect air quality. If you have an independent study that shows otherwise please provide it. I am always on the prod for new information.



Did you read the link, and all the links in it,that the OP posted.

[classical]

Did you read the link, and all the links in it,that the OP posted.

I read the article and two of the links have not had time to read all of them. I do not disagree with anything in the article in fact most of what is in there I surmised years back.

This is what I am saying "UV" lights A B or C do not kill airborne bacteria or viruses in moving air therefore they will not improve the quality of the air in a home or office. Now that is not to say they will not clean a coil or maintain a coil that has direct irradiation. My contention is with good filtration they are unnecessary because if the coil is clean to begin with the filter will prevent a substrate build up so mold or mildew will not be a problem.

I have used lights on dirty coils in fact I think they are a better option than cleaning.

I do not believe that and have seen no data that would support the contention that a light would reduce illness in a home that has a clean system to begin with.

As to the hospital in McAllen from what I read the benefit comes from the cleaning affects of the coils. As I stated earlier "UV" lights on large system coils is a benefit because filtration is more problematic on large system especially compared to small contained home systems.

[dash]

Read the spec on the filters you install,not 100%,UVC prevents biofilm on the indoor coil,which is a health hazard,and not detected by coil PD.

I would still suggest a merv 12 filter first,but UVC has a place in IAQ,IMHO.

[JKSERVICES]

do a search, we have discussed this b4 several times

the short version, i had one, and it worked!



.

I have one and all the ones i installed have definitely kept the coil from getting all slimed up and moldy, do not know how well they clean the air, but coils have a lot less mold!

[commerce48]

http://www.rses.org/rsesjournal/article.aspx?ArticleId=2007

There is the web version of the article.

As far as my wife's immune system, friend, you don't live here. What gives me a one day cough and sniffle knocks her flat for a week and a half, sends her to the ER, and to the doctor's office multiple times.

Thanks for the link. A careful skim of it (and a couple of other links) only showed benefits of UVC for keeping the coil clean. Other benefits had ambiguous language at best, citing others without specifics. I can believe that keeping the coil clean could have some health benefits for very compromised immune systems.

No, I don't live with your wife's immune system and I can appreciate your concern. Her health in general may make it harder for her to recover from an illness, however her primary condition would not seem to make her any more susceptible to catching colds and such. Either way of course, it would be beneficial to stop any illness from starting.

It is your money, but I think you are chasing vanishing returns by chasing an IAQ solution. Not trying to be funny, but if she is staying at home, you are the source of any viruses she is catching. Washing your hands frequently, especially before returning home, will reduce infections far more than anything else you can do at any cost.

[Airmechanical]

I have one and all the ones i installed have definitely kept the coil from getting all slimed up and moldy, do not know how well they clean the air, but coils have a lot less mold!

okay, let's break this down

"it kept the coil from getting slimed up and moldy"

does anyone think that the air passing by that coil without slime or mold will be any cleaner than the air coming by a slimy and moldy coil

HMMMMMMMMMMMMMMMMMMM!

if you think the air is cleaner coming by the clean coil

you may have just unknowingly used common sense



.

[teddy bear]

A fresh air change every 5-6 hours when the home is occupied is a must. Fresh air purges the indoor pollutants like formaldehyde. Keep the equipment clean by using a minimum of merv 11 air filters. Maintain <50%RH through out the home during cool wet weather to avoid mold and dust mites. Dry out your cooling duct work for several days to avoid mold growing in the ducts. Green grass climates require supplemental dehumidification during wet cool weather. Regards TB

[jpsmith1cm]

Define 'green grass' climates, please?

[davo]

I have severe asthma and allergies. I am very prone to respiratory infections. Here is what I do in my home.

Dilution: Carrier ERV, Balanced and Resricted down to 60CFM OA (feeds in to de-humidifier)
De-humidification: Thermastor 90 pint per day de-humidifier, HEPA filter installed, set to 45%. Feeds in to Infinity Air Purifier. Thermastore control lets me control how long I have 6" OA damper open.
Filtration: Carrier Infinity Air Purifier. MERVE 15, Rated by CDC. Very low ozone production, less then a television.
A/C: Carrier Infinity System, set for 50% humidity level. Fan set for continuous Fan "LOW".
UV GERMICIDAL LIGHT: 2- Two 18" bulb Fresh Air UVC germicidal light systems. This has kept my air handler, blower and discharge duct (first 6 ft or so anyway) mold free for 8 years now, in SW FL. They will only keep illuminated surfaces clean, but that is important. I too doubt how they actually affect the air. DO NOT USE OZONE SPLICE BULBS.

I notice a big difference when all is turned off, so I never turn filtration off.

Cost of operation has much more than been offset by reduced usage of allergy meds! (About $50.00 per mo.reduction in med cost)

Good luck!

[hvacmd]

The Gaurdian is now EPA,GSA,U.S Military,Chicago Public Schools,CSA and otherwise approved by Japan,China,Canada and more.We provide them to alleviate smoke damaged homes,ethnic cooking odors,pet odorss etc. I am not aware of a easier to install or more cost effective product.Especially to an HVAC contractor,the element replacement life is three years.

[tedkidd]

Here is what I do in my home.

Dilution: Carrier ERV, Balanced and Resricted down to 60CFM OA (feeds in to de-humidifier)
De-humidification: Thermastor 90 pint per day de-humidifier, HEPA filter installed, set to 45%. Feeds in to Infinity Air Purifier. Thermastore control lets me control how long I have 6" OA damper open.
Filtration: Carrier Infinity Air Purifier. MERVE 15, Rated by CDC. Very low ozone production, less then a television.
A/C: Carrier Infinity System, set for 50% humidity level. Fan set for continuous Fan "LOW".
UV GERMICIDAL LIGHT: 2- Two 18" bulb Fresh Air UVC germicidal light systems. This has kept my air handler, blower and discharge duct (first 6 ft or so anyway) mold free for 8 years now, in SW FL. They will only keep illuminated surfaces clean, but that is important. I too doubt how they actually affect the air. DO NOT USE OZONE SPLICE BULBS.

I notice a big difference when all is turned off, so I never turn filtration off.


Good luck!

wow, nice setup. Surprised you didn't go with the hp.

[davo]

wow, nice setup. Surprised you didn't go with the hp.

It actually is an infinity HP! 38YDB036

[Kevin O'Neill]

I have installed a RGF in my home for odor control. In 10 minutes, the ozone is so bad it runs me out of the house. It runs my wife out of the house too. I have sold two to a hypochondriac, but the two other people I sold one to wanted their money back because they could not stand the ozone.

If you are not sensitive to ozone, it may be good for you. Bur beware of side effects.

[teddy bear]

I have installed a RGF in my home for odor control. In 10 minutes, the ozone is so bad it runs me out of the house. It runs my wife out of the house too. I have sold two to a hypochondriac, but the two other people I sold one to wanted their money back because they could not stand the ozone.

If you are not sensitive to ozone, it may be good for you. Bur beware of side effects.

Kevin, go for the air changes with filtered fresh air and humidity control. I know were you can get a good deal. Regards TB

[meBNme]

I'd reccomend you look into this product.

https://www.activtek.net/CatalogProduct.aspx?ProductId=US40532

It seems to be the best of that type of technology.

The product does produce low levels of ozone, but then converts most of it back to Oxegen.

They also have units that are identical, but produce no ozone.

The only negative feedback I have heard in this product is from people who do not have one.

So far, every customer, employee and technician (with this company and the onther company in my area that sells them) who has one is very pleased with it.

I have not yet seen a product that the technicians are buying for their own use in their own homes in such numbers and with such enthusiasim as has happened with this product. (The "Induct 2000" by "ActivTek")

Whatever product you choose. PLEASE give us progress results after it has been installed for a while. Direct feedback on "new" technology is so very valuable.

[chilliwilly]

I have installed a RGF in my home for odor control. In 10 minutes, the ozone is so bad it runs me out of the house. It runs my wife out of the house too. I have sold two to a hypochondriac, but the two other people I sold one to wanted their money back because they could not stand the ozone.

If you are not sensitive to ozone, it may be good for you. Bur beware of side effects.

I'm not familiar with this system, does it have a regulation control governed by a feedback signal from an air analiser?

The system that we use in laundry is Opura and maintains a span of 0.001-0.009 ppm for when it spills out of the machine. In addition it has an ozone destructor drawing air from out of the washing machine which consists of a charcoal filter that neutralises the ozone.

You can just about smell the ozone when its at these levels, and is much less worse than a photocopier machine. If the system you are refering to has this kind of control then maybe it needs tuning. Or if its just a cheapo, then it needs to be developed further to control its output.

The use and demand of ozone for disinfection and odour control is on the increase, and the Opura system has been proven to kill the MRSA, Legionella, and Ecoli virus commonly found in the hospitals over here plus many other nasties. Even when the ozone dosage is at these levels.

I just wondered if any one had actually come across a system like this in a ducted system, and if so does it have a destructor to stop the ozone from going beyond a disinfection chamber or zone within the ducting.

I thought if this was the case, I myself would expect to see the air return being disinfected before it reaches the evaparator or within the evaporator by maybe one or more sparge nozzles in the condensate tank to control the bacteria in there as well. And then a sensor within a section of duct that contains a destructor on the air flow. Followed by a final sensor before the air reaches the grills/registers.
:anyone:

Sorry about this jp but we've gone from UV to ozone. Sh!t happens ha ha.

[teddy bear]

Define 'green grass' climates, please?
Sorry, I missed your question. Climates that have enough outside moisture in the air to maintain green grass growing through the summer are humid enough to raise the %RH inside the home to require supplemental moisture removal to avoid mold/dust mite growth.
Regards TB

[jpsmith1cm]

Sorry, I missed your question. Climates that have enough outside moisture in the air to maintain green grass growing through the summer are humid enough to raise the %RH inside the home to require supplemental moisture removal to avoid mold/dust mite growth.
Regards TB

Thank you.

Sounds like I'm there.

Will be doing some more work on HVAC system as time and cash flow permit and will be sure to post results and thoughts as they come.

Also, as I said before, I will be making notes on this for my wife to take to her doctor and will look into his suggestions as well.