I'm sorry to have to give this company a bad review. The person who referred me said that she had not had a complaint before. Two years ago, NAZAIR replaced a roof, whole house air conditioning unit. The cost was steep, but it had to be done. Move forward two years to early October, 2015. The tenant called and said water was coming through the ceiling and down the wall of one of the bedrooms. NAZAIR and our State Farm rep went over to assess what was happening, since a roofer indicated that the issue was coming from the A/C. It turned out that when NAZAIR replaced the 25 year old A/C unit, they reattached it to a 25 year old condenser line. Didn't offer to replace it (for a cost), or anything else when they initially installed the new A/C. Thankfully the State Farm rep was there and said that this definitely should have been done two years ago. So NAZAIR said they would immediately replace the line, which they did. We then, to the tune of $600, replaced all the problems caused as a result inside the house. Three months later, more water, gushing into the house, redamaging the same area plus some. Turns out that when they rerouted a new condensation line they jarred the A/C unit leaving a hole in the roof. Decking needs to be replaced as well as all the damage inside, new insulation, etc. etc. So we will be out around $2000 by the time all this gets fixed. Still, I let it go UNTIL I GOT A BILL from NAZAIR for $101.50 for the repair made back in October. I talked to them, reminded them of everything that had occurred, and they still insisted that I pay the bill. It's obviously not the money ($101.50 in the whole scheme of things isn't much), but the lack of ownership for a problem they caused. I was clear that I didn't expect any more from them, other than waiving the $101.50. They wouldn't do it. We own many, many rental properties, so it's not as though I don't know any better. I do. It could happen to you, beginning with lazy installation and following with lack of care about the results of their lazy shortcuts. This was a hidden problem. Short of standing on the roof when they install, you will not know what shortcuts they take. And when they do, they will not take responsibility for fixing the problem.