Re: Ducts Cleaning
I have heard this too, and as a result have never had my ducts cleaned. The theory is that yes, the procedure cleans your ducts well, but it dislodges an awful lot of dust that is then released everywhere throughout your house. I guess normally, that dust buildup in the ducts is fairly stable/contained. If you use a good HVAC filter and change it regularly, along with filters at the registers, you are supposedly well protected from the dust buildup.
The jury is still out for me - I would have to be pretty well convinced of a good seal throughout the whole duct-cleaning system before I would try it.