I got to know them through Groupon but I called them and booked for appointment. The availability for next appointment is reasonable and they are flexible and can accommodate week-ends too. I needed additional hook-ups as my furnace is complex. They covered it at no extra cost. No hidden fees and furnace blowing option included in their basic package of 12 vents.
Since my A/C coil is sitting just on top of furnace blower they recommended me to go with A/C coil cleaning as well and I was very Happy with the overall package they offered. I already recommended a friend of mine and I am writing this review after taking his opinion on their service.
My only disappointment is with their timing. They Scheduled a time for which I have to start early from office. They turned up bit late to the working site. I won't mind on this as the service they provided is worth the wait but quoting it so that they will improve on this.