Here is a list of questions to ask when choosing an air duct cleaning company.
How long will it take?
A proper cleaning takes time and attention to detail, we usually spend at least 2 to 3 hours at a job. For larger houses we usually take 5+ hours to complete the job.
How many access points will be made?
It is very important to create access points on each of the main ducts, and we are not referring to 1 inch cleaning holes. Make sure the company you hire creates enough access points to inspect everything they clean.
What kind of vacuum will be used?
Proper air duct cleaning takes a tremendous amount of suction. Our Hypervac 220 creates about 5000 CFM (cubic feet per minute) of suction. We bring our vacuum right in the house and set it up as close to the furnace as possible. The more suction hose you attach to a vacuum, the less suction you will have. In our opinion anything less than a 220v system will not be sufficient.
What kind of tools will be used?
If the supply runs in your house are 20 feet long or have bends in them you will want to make sure the company you hire is using tools like long air whips and agitation devices to properly scrub your ducts. This method will push the debris all the way down the branch toward the vacuum. A simple hand valve is only going to send the debris 5 or 6 feet down the duct.
Will they seal off your system?
Unless they have a powerful truck vacuum and your house is small, you’ll want to make sure that they completely seal off your entire system. If they leave all of the vents open, the suction loss will be tremendous and there will not be enough negative pressure to complete the job.
Do they use cleaning zones?
To maximize negative pressure, most professional air duct cleaners will create zones for cleaning. This adds time to the job but ensures that your system will be thoroughly cleaned. If the company uses portable equipment then cleaning zones will be necessary.