Some research suggests that cleaning heating and cooling system components (e.g., cooling coils, fans and heat exchangers) may improve the efficiency of your system, resulting in a longer operating life, as well as some energy and maintenance cost savings. However, little evidence exists that cleaning only the ducts will improve the efficiency of the system.
Had our ducts cleaned late April, 2016. Sodium Chlorite was sprayed into ducts after cleaning. Ever since, we have been bothered with eye and nasal passage irritation because of a “chemical” and “musty” odor. This odor is present whether or not a/c is on.) We are told the sodium chlorite (“EnviroCon, manufactured by Bio-Cide International) is used in hospital and nursing home settings and is not hazardous to health. The air duct company’s suggestion is that they come out and spray even more sodium chlorite…we absolutely don’t want this done! Have had various other recommendations about what we need to have done to remedy our problem. We will be unable to stay in our home if a resolution cannot be found. We’d be willing to replace the ductwork if necessary. (One professional suggested that the cleaning may have “knocked something loose” inside the ductwork and that is the source of the irritant.) This home was built in 1920…no idea when the present ductwork was installed. Any suggestions would be appreciated.

A year and a half ago (fall of 2015) we replaced the furnace and air conditioner. From what we could determine this was the third forced air furnace and second air conditioner unit for the house. As part of the installation, we changed out the two 6″ ducts feeding the second floor with 8″ ducts. The idea was to get more cold air to the second floor in the summer. It worked and for the first time the second floor and first floor temperatures were the same when the air conditioner was running. Of course, to make the system work I close down upstairs duct damper doors in the winter and open them up in the summer.
The headache started with a Groupon purchase. Service for an air duct cleaning was purchased and scheduled. When the guy arrived he attempted to say that the purchase was only for a vacuuming of the vents and not a duct cleaning. Despite showing him the groupon he refused to do service. We then contacted Jennifer at this company and eventually got on a three way call with groupon who agreed with us that the service was for a complete air duct cleaning and not just using a hand vacuum to clean vents (something we could do any time). Jennifer has since hung up on my wife twice despite being civil and merely asking for the services we paid for. Unprofessional.
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.
This company upcharged me $200 for a service we had already paid for. Also the girl I spoke with on the phone was extremely rude!! Come to find out that person is the owner! She yelled at me each time I asked a question pertaining to how they scammed me for a service I already paid for. Advertising all over great deals on Groupon and everywhere else do not do it they get in your house they upcharge you they do all these services in a half an hour and say they're done!!!!!!!
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!
Chemical biocides are regulated by EPA under Federal pesticide law. A product must be registered by EPA for a specific use before it can be legally used for that purpose. The specific use(s) must appear on the pesticide (e.g., biocide) label, along with other important information. It is a violation of federal law to use a pesticide product in any manner inconsistent with the label directions.
He proceeded to clean each heat register by removing the grille and blasting it with an air pressure hose toward the duct opening thinking that the dust would magically be sucked inside. In one room this caused a ceiling smoke detector to go off because the excess dust fooled it into thinking there was smoke. I put my hand in front of a register he wasn’t working on and could hardly feel a suction. Although we discussed how I open and close damper doors, I realized later that he never checked, opened or adjusted them during the cleaning. He could have closed all but the one he was working on in order to increase suction results. His next step was to blast air into the duct and then attach a “squid-like” device that slapped around inside the duct as far as he could reach. This is important! In a newer house, ducts have long straight runs from the furnace. In older houses like mine they can turn and twist. In fact, the duct we have a problem with runs straight up from the basement inside a wall and turns 90 degrees into a soffit for three feet then into two 90 degree turns to get into the floor joist area for another two feet and finally a 90 degree turn up to the second floor register. When he cleaned this one he could only get three feet into the register with the hose or squid because of the turns. That was the case with most. Hardly what could be described as a decent cleaning.
I have lived in Calgary for quite some time now. When I first moved here I couldn’t stand the humidity levels. Its like a desert come winter. When I first moved into my new home, the house inspector insisted I have my furnace and ducts cleaned. I was very sceptical about duct cleaning to begin with. The company I hired came on time and were very respectable from the start. Before mentioning anything they asked me what my concerns were and what issues I was having. They were more concerned about addressing my issues then bringing anything non related up. I ended up going with this company and getting a humidifier installed a couple days later after the cleaning. Its been almost 4 years now that I have been here. The humidifier is working great and the difference is incredible. They took me around explained step by step what they were doing and the reasons they were doing it. With all those other companies out there, I am glad I found them at this site.
fact is most homes have bad filter racks. when you insert the filter it doesn’t seal well to the sides so some of the air and dust bypass it and end up in the supply ductwork and into the house. Most of the dust in the supply ductwork settles down and doesn’t get blown in the house but some of it does when the blower starts up or when you put a new filter. If you have allergies or other health problems put in an electronic air cleaner, get your ducts cleaned and run the fan as much as you can afford. you can also get an ECM motor installed which is going to be worth it if you want to run the fan 24/7. If you have uninsulated metal ducts take down the ones you can and wash them. Then put them back and seal the joints. Cleaning the ductwork also improves airflow which is important to AC and Heat pump systems for efficiency. An electronic air cleaner will also improve airflow and static pressure because they usually have a much larger filter surface area. An electronic air cleaner also keeps the ac coil clean like new which means better efficiency and no cleaning needed. AC furnaces sometimes grow mold around the coil because of the condensation. Electronic air cleaners should be able to filter mold spores but the best remedy is installing a UV light next to the coil which will kill the mold.
In addition, the black dust was found in most of the heat registers. He could rub it off on his fingers but did nothing but spray compressed air on it which didn’t make it disappear since it wasn’t loose. Also, in the register in the basement he described the black dust as being oily. The reality of that situation is that I had the AC on until the morning of the service and minutes after he snaked the hoses in my back door it started raining. The basement register had condensation from the humidity all over it. It was not oily but wet. He asked for an old towel and wiped it out. Never saw anything so black – because I never had to clean soot. That is what I have in my ducts. Soot from years of the old coal furnace.
They were ok.  I had another group that came out that was much more thorough.  When I asked them to come out, they've always been good about that.  I make the appointments, all of them.  All of them, I make the appointments.  They were ok.  They cleaned the ducts.  But I've had others come out from Angie's List that have been much more thorough.  It's all on my terms.  Other people came out and they were much more thorough.  I would have given the other people an A.  They didn't take the ducts down.  The other people took the ducts down, they cleaned the vents and the whole bit.  They said that they could just do it like this and it works well.  I thought good, fine whatever.  It was positive that they came out on time.  They were very nice, they did their job, like I said, they weren't as thorough.  They cleaned my vents, but the other people that came out before, they took the vents out, they washed the vents, they cleaned every vent.  Whereas these people came in, they took the vents off and go I can suck all of his through these three vents with one hole.  And I'm sure they were right on that, but the other people did it differently.  I would not use them again because of that.  To make it better, clean out each and every vent and to clean the vents themselves.  The other people came out and they cleaned every vent that was exposed and they would go in and they cleaned out every vent.  Each one was cleaned out, not one vent will clean out three.  That kind of thing. Price was good.  I know you guys charge a fortune.  You take 40% of what they make.  I've learned that from a couple of them.  That's extreme.  They were all fair.  The prices were all fair.  But I felt bad that Angie's List took 40% of what they did because they did all the work and Angie's List took 40% of their profit, or their cost.  Now you're aware of it.  I've had three or four of them say that to me, and they said, well, we're not complaining because they keep us busy, but you know, that's not fair.  That's too much.  Everything's fair.  If I didn't like the price, I wouldn't buy it.  When the other guys came out, they did every single vent and they didn't.  I really don't like the fact of putting somebody down.  That's the way I am.  They did the work, they did what they felt they needed to do.  And it was different than what I've had in the past.  And I have allergies and all that stuff, so I really want all that junk out of there.  But, I wouldn't put them down.

To make things even more interesting, I called their number this morning to do some investigation on what they actually do.  After I revealed to the girl I had the service done a day prior and that my technician, Simon, didn't clean them like it should be done she drops a bomb on me.  Simon is actually the owner!!  The whole time, he is telling me that he is on the phone with the office to see if the can get me a better price on the additional cleaning, he is basically full of sh!+.  An owner doesn't need to do that - he is just pulling a bait & switch on me.
Some research suggests that cleaning heating and cooling system components (e.g., cooling coils, fans and heat exchangers) may improve the efficiency of your system, resulting in a longer operating life, as well as some energy and maintenance cost savings. However, little evidence exists that cleaning only the ducts will improve the efficiency of the system.
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