We purchased a Groupon for Modern Purair to clean the vents in our home. We found it very easy to use the Groupon and to secure a time for Purair to come to our home. The cleaning of the vents took approx. 2-3 hours after they did the vents in our home they also cleaned the dryer vent. Purair arrived on time, when they came in they were very professional and clean. We were very happy with the work that they did for us and are pleased we found them on Groupon.