About 5 years ago I had Den Air install my A/C unit. Since then I've had nothing but trouble with their installation. For one, when I had someone come and try to clean the ductwork, they informed me that the unit was installed so poorly that they could not get at all the ducts, and only ended up cleaning what they could reach. Very annoying. Now, the reason I'm writing this, a reputable repairman informed me that due to the poor installation 5 years ago, a unit that should have no troubles for at least 10 years after installation now has a leak that will require extensive repairs.