I had researched by HVAC system and saw electronic air filters for over $1000.  That was too much for me.  But Simon introduced me to a product which uses ultraviolet light to further clean the air going into my home from the HVAC unit, and he gave me a discount because of the totally thorough cleaning I had purchased.  This unit attaches to the duct coming after the air filter and comes with a lifetime warranty.  Included in that lifetime warranty is a visit every two years to replace elements of this air cleaner, and a free air duct cleaning.

A study done by U.S. Environmental Protection Agency researchers measured dust levels and HVAC system efficiency in test homes during a one-week period during the cooling season and found duct cleaning did not significantly improve dust levels or system performance. Based on that report and other independent research, the EPA’s official advisory on duct cleaning concludes:
Most organizations concerned with duct cleaning, including EPA, NADCA, NAIMA and the Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) do not currently recommend the routine use of sealants to encapsulate contaminants in any type of duct. Instances when the use of sealants to encapsulate the duct surfaces may be appropriate include the repair of damaged fiber glass insulation or when combating fire damage within ducts. Sealants should never be used on wet duct liner, to cover actively growing mold, or to cover debris in the ducts, and should only be applied after cleaning according to NADCA or other appropriate guidelines or standards.
I did the $49.00 Groupon they just left. Basiclly all they did was stick a shop vac type hose into the vent supply and one return. I also had the dryer done. the person in charge pointed to the main return inside my humidifier and said it needed cleaning. I explained that I was in facility maintaince and would deal with it myself. After that they finished the vac and didn’t try any other sales pitch. I should have read the reviews before I bought this wast of money and time.
All of the products discussed above are registered solely for the purpose of sanitizing the smooth surfaces of unlined (bare) sheet metal ducts. No products are currently registered as biocides for use on fiber glass duct board or fiber glass lined ducts, so it is important to determine if sections of your system contain these materials before permitting the application of any biocide.
You and your family spend hours sitting on your favorite chairs, couches and sectionals. Over time, dander and body oil become trapped in the upholstery, but with regular cleanings you can keep these delicate fabrics looking, feeling and smelling great. We examine your furniture and select the best process to safely clean and protect any kind of upholstery, including leather. 
“Duct cleaning has never been shown to actually prevent health problems. Neither do studies conclusively demonstrate that particle (e.g. dust) levels in homes increase because of dirty air ducts. This is because much of the dirt in air ducts adheres to duct surfaces and does not necessarily enter the living space. . . . Moreover, there is no evidence that a light amount of household dust or other particulate matter in air ducts poses any risk to your health.”
Although it intuitively makes sense to clean ductwork — after all, you dust and clean the rest of your house — the fact is dust that settles in your ventilation system generally stays where it is, unlikely to become airborne unless disturbed. Under most circumstances, the dust is inert and harmless, and stirring it up with cleaning equipment actually creates bigger issues.
3/8/2019Thank you for your feedback.  Yes, we were late, and we apologize for that.  Sometimes things happen, unfortunately.  However, it was not no show, no call.  There was a technician in your home today.  He began to take the vents off.  You advised him since they were behind schedule, he would have to leave and the service could not be completed.  He then put the vents on and left.

We are a hvac company that provide air duct cleaning service are minimum charge $400 to do a proper air duct cleaning with 2 techs avg 3-6 hours that includes sanitizing. I get phone calls all day about the $99 your not going to get much of a cleaning for that price it for them to get there foot in the door and up sell that the only way for them to stay in business. Just from my 15 years of duct cleaning experience.

Interestingly, I had this service performed several years ago, by a cheaper company.  Based on the amount of dirt and junk that was removed yesterday, I now have my doubts that the previous company really performed the work.  Yes, I checked  this time!  The owner, John, told me that there is another company working under the same name, so make sure that you are getting the Arizona Air Duct Cleaning Company, father and son team, that is being reviewed here.  Not all these companies  are honest and do what they claim to!
I was hesitant to have him do that for the price he quoted me. It would have been an extra $275+ for additional cleaning!! I certainly wasn't prepared for that, so I declined the offer.  After his assistant started to use the shop vac to get some debris out of the vents, he came back in and said he was just on the phone with the office and he can lower the price of the additional service for me.  He wrote up an estimate for me and said that I could call him if I'd like to do the service.

Very interesting article. I searched articles about services for cleaning ventilation systems. But I have some questions. For cleaning ventilation system used special products for cleaning. Can I know in company manager about, which type of cleaning products they use? Your family members may be allergic in some components. It’s very big problem. And one more problem it’s how to choose the right company in Internet. Sometimes I don’t have much time to find a company in my town and I use the Internet. But I find a lot of company. It is very popular services, for example, Stanley Steemer – https://www.stanleysteemer.com/ or my local not very popular service, for example, AllstatesAirDuctPro – http://allstatesairductpro.us/. Can I understand the company is professional or not, only looking through the website? What must I check on the website? Who has helpful information? I will very grateful for your help. Links I add for understanding my problem. They are random and not for advertising.
Well, I had the cleaning done. The handler is definitely much quieter. It was explained to me that with the coils clean, the condensation will be able to sweat off instead of sticking to the dust and dirt, therefore the humidity (lots of humidity in florida) will be removed better. I feel as if it was worth it, but, I will definitely change that filter every 3 weeks or so from now on. I don’t want to pay that cost again.
I guess I should present my credentials first, I am a 30 year veteran of the heating and cooling industry. I started at the bottom and have participated in every area of the trade. Installer, service, maint. Ownership, rep, territory manager and so on. A forced air duct system is a large vacume. Like your vacume it has an air intake (return air) and an exhaust (supply registers). A filter just like a vacume (located next to furnace or air handler). Now I want you to visualize something. Put your head inside your vacume cleaner and breath. Get the picture? This is what your duct work looks like. Do you clean your vacume when it’s dirty? If it’s full and the filter is dirty you lose performance and it starts poluting the air you breathe. It’s common sense. I recommend hiring a duct cleaning outfit that you have researched to be honest, background checked, drug tested, insured, and highly recommended by your piers in the area. The service is a necessity, but like everything, it should be done by a qualified company.
if you do not want to put that dryer cleaner down your ducts (I don’t because if it gets stuck somewhere you will be stuck calling a pro to get it out! anyway what I did was take the furnace filter out for max air flow, and then close off all your vents leaving only one open at a time to clean. This directs all the air from your system only to the vent going to the opening you are cleaning. Then stick the flexible tubing of your vacuum cleaner down a bit into the vent and turn on the vacuum. Then go to the thermostat and turn on the fan only and let the vacuum run for a few minutes. That does a great job and you can do it with or without the brush. When done put a fresh filter in. I only do this for the vents where the air blows out. I would not recommend cleaning the cold air returns this was as you would likely be forcing dirt and dust into your furnace. If you want to vacuum the cold air returns, turn the system off
Air duct cleaning companies are responsible for eliminating dust and other potentially harmful elements that can build up inside the air ducts of your home's cooling or heating system. If you need your air ducts cleaned, you may want to seek an air duct cleaning company that has specific knowledge, qualifications, and experience to ensure your home is properly cleaned and left uncontaminated. This article provides details on how to best choose an air duct cleaning company.
A thorough visual inspection is the best way to verify the cleanliness of your heating and cooling system. Some service providers use remote photography to document conditions inside ducts. All portions of the system should be visibly clean; you should not be able to detect any debris with the naked eye. Show the Post-Cleaning Consumer Checklist to the service provider before the work begins. After completing the job, ask the service provider to show you each component of your system to verify that the job was performed satisfactorily.
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