What is the best choice for duct cleaning? What is the best way to enjoy an air duct cleaned. There seem...

What is the best way to enjoy an air duct cleaned.

There seem to be a few choices.

1. there is strong vacuum stemming from a truck that vacuums
your duct system

2. some guy comes surrounded by with a strong hepa vacuum and uses refusal air vacuum force to suck surrounded by all the materials from teh underground store area where on earth all the duct work starts.

3. some guy comes within with a rotobrush device...and goes into respectively vent individually wiht a long hose and vacuums there...which is the best.

Thank you,
Ira
If in that is a slick coming from...
Answers:    I worked on HVAC breiefly and depending on how ancient the duct is and how much the cost of each is it might be more cost decisive in the long run of late to replace it yourself. It depends on why you want it cleaned such as decreased airflow or anything your complaint is. To replace it it would probably be cost less later 500 for materials and take just about 1 day to run it so numeral out what is best for you
What does it be set to when a...
This is usually a rip off where on earth they try to sell you stuff once they are within the house. Get a HEPA type filter and keep on going.