Make sure that the company has the proper equipment and enough HEPA filtered vacuum power (2,000 CFMs or more), to properly clean your air ducts. Be weary of companies that use small vacuum units that have a small rotating brush on the end of a small vacuum hose with a typical airflow of 150 to 300 cfm or less. Proper air duct cleaning vacuums are negative air machines with 2,000 CFMs have 8 inch to 14 inch or larger, vacuum hoses to capture large quantities of dust and debris.
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Since your dryer has to blow exhaust air out through the ducts, the shorter the ductwork, the better. The total recommended length is normally less than 25 feet from the back of your dryer to the outside vent cover. If the duct has bends and turns, it should be an even shorter distance. The more turns, and the further the distance, the harder your dryer must work to move exhaust air and loose lint. A clogged dryer vent means:
The amount of time air duct cleaning takes can depend on how extensive your duct system is, how old your air ducts are, and whether they have ever been cleaned. On average, expect a standard size home (between 2,000 and 3,000 square feet) to take 2-5 hours for one to two technicians to clean. Here are the proper protocol and equipment you should expect from a professional duct cleaning service, as recommended by the Environmental Protection Agency:
The first step is to clean the lint trap after every load of laundry. By doing this simple cleaning regularly, you will avoid 90% of dryer vent problems. You should perform extensive cleaning annually, or sooner if you suspect a problem. Unplug your dryer and pull it out from the wall, then disconnect the exhaust tube from the dryer and the wall, and clean it with a vacuum.
A. First of all, be sure to be there when they do the job! We had our ducts cleaned and got robbed by one of the workers who thought we wouldn't miss a few "minor" personal items. But, even though they didn't believe us at first, we reported it to the police and the company and he got caught! Secondly, ask if they not only remove the vent covers but clean those too. Ask how they clean them and if they use their own cleaning supplies and take the vent covers outside to clean--not in your bathroom or kitchen sinks, using your personal towels. Ask if they clean up the lint that falls into the room with a vacuum cleaner. They should have a crew of at least two people to put the hose in and clean out the vents and one to clean the vent covers and the area around the vents where the lint falls. They should clean the air intake vents and cover also. Some try to sell you on cleaning out your actual AC/HVAC unit coils. I don't see the need for that, but if they insists it is needed, get them to show you the dirt in there that they will be cleaning out. If they can't show you, chances are they will not be able to get in there to clean it. They should change the air filter, but be sure they don't try to sell you some heavy-duty, life-time guarantee filter that supposedly never needs to be replaced. Those don't let enough air flow through. The medium grade ones changed every few months or so work the best. You can buy those at a home improvement store and change them out yourself during the year. Make sure that they don't damage your walls with their big machine, trying to get it down the hall and around corners. They damaged our walls, too and we had to have them plaster and paint it again. Just because the company has a nationally recognizeable name doesn't mean they will do the best job. Often these are owners who hire flunkies to do the work who are thieves and don't care. It would be better to get a local guy that has been doing it a long time and can furnish you with references of satisfied customers.
"So My A.C. suddenly went belly up and I needed a total brand new unit inside and out. So a little background on myself. I'm an engineer, so I know a little bit about A.C. and how they work. I'm by no means an expert, but it does allow me to detect if the A.C. guy knows his stuff, especially if they don't know what I do. 😉 And I'm happy to say, these guys do. One of the things that helped me chose them is that they brought up the importance of controlling humidity. None of the other contractors I spoke to, mentioned that. I also appreciate the fact that he didn't try to "up sell" me and get me to buy things I didn't need. He was on time, honest and forth coming about what I needed and what I didn't. When the workers came, they were on time, very professional and very CLEAN. After they left, I couldn't tell they had been there. Highly recommended this service."