Don't be tempted by the $49 \"special\" or \"unlimited vent cleaning\". They have no intention of honoring it. Its just a way of getting in the door and trying to get at least $200 out of you. They'll tell you that because of something they see on your vents, such as \"they were never cleaned\" (when you know for a fact they were), or there's mold somewhere or all kinds of pollutens or promise to help with your allergies...all of these are reasons why they can't do the service that is in the voucher (from kudzu, groupon, the newspaper, etc.)