My wall unit air conditioner needed a regular annual maintenance. I bought this unit from Air Quality several years ago. The serviceman attended to service the unit. The quote was $144, taxes in. A short time later the serviceman approached and showed me a bit of lint he had extracted from the AC unit. Great, I thought, you're doing a great job. Things are not always what they seem, however. He told me that he couldn't get all the lint because it was in a tight spot and he would have to use a special solution. Okay? Now, here's the kicker, it would cost an extra $144 to clean the extra lint. I expressed to the serviceman, this is why you're here, to clean the AC Unit at a stated cost of $144 using whatever means necessary. I refused to pay the extra $144. The serviceman said that for sure I would have to clean the excess lint next year. Never mind that, obviously, the extra lint didn't have to be cleaned this year but the fact that I would have to pay just short of $300 for this regular maintenance job is in my opinion, grossly unfair and a big rip-off. I will not be using Air Quality Dunrite to clean my AC anymore.