Thanks to everyone who responded with recommendations for residential air duct cleaners!<br><br>Here are the tips I received:<br><br>We used Air Duct Maintenance - (800) 922-DUCT.  They did a great job and came extremely well recommended.<br>
<br>**<br><br>Servicemaster of Greater Pgh.  I used to work there and they do a great job.  412 826-1010 tell them Debi from HP told you to call.  They do a much more thorough job than some of theses places that just vaccum the duct openings.  They send a device all throughout the duct cleaning it out. <br>
<br>**<br><br><a href="http://blogs.consumerreports.org/home/duct_cleaning/">http://blogs.consumerreports.org/home/duct_cleaning/</a><br><br>**<br><br>I haven&#39;t used one but just wanted to pass along that there are filters you can put on the inside of the vents.  You can get them at Home Depot, or a sheet of the material that you cut up yourself.<br>
<br>All best,<br><br>Ariana<br><br>