We needed to replace an 18-year-old central AC with a struggling compressor. An AB May salesman came out immediately. He said we couldn't get the truly quiet AC we really wanted without replacing the furnace, too, which seemed foolish since it was working perfectly, so we declined and just accepted the regular AC. I don't know why an AC couldn't be made quiet without having to go through a specific brand and type of furnace, but I guess that is just another way to make extra money. I stressed repeatedly that we definitely wanted something quiet because of sound sensitivity issues , and he assured me that the interior noise would be the same since the blower would be the same, and the exterior noise would be quieter because the compressor was insulated and wouldn't be making the "last legs" noise of our current compressor. (I know that the AC industry's definition of quiet seems to be very different than my own--they mean "slightly quieter than a jackhammer," while I mean "just barely audible," but this was the 3rd co. I had called, and I was concerned that our AC would quit in the 90 degree heat, so I accepted AB May's bid). 2 technicians came out first thing in the morning to install the AC. They initially said they would reuse the coil cabinet and "upgrade" our breaker from "20" to "40" to handle the greater power of the new system. A freak storm knocked out our power, so they were working in the dark with flashlights for quite a while. They didn't end up to reuse all of the coil cabinet--they cut off one of the walls of the cabinet that came with the coil and taped that on instead, which could have affected the acoustics. They left without being able to test the AC. I noticed that they had left a huge grease/oil stain on our new rubber flooring, killed some of the plants around the AC (which maybe was unavoidable), and torn up the wood frame around a small new concrete ramp near the garage door and left the pieces lying nails up (I guess while checking the pipe that runs through the garage into the house?). The wood frame wasn't a big deal since it had served its purpose; I just wish they had told me they had removed it so I could clean it up. Later that evening when the power was back on, a different technician came out. He couldn't get the unit going and said he thought the first 2 technicians had installed a faulty breaker. A fourth technician came out, and they finally got the AC working with a "30" breaker. I could feel there was some air flow around the seams of the coil cabinet. I also noticed the pull light in the basement wasn't working anymore, and the technician said he guessed he had pulled too **** ** it and broke it. The blower was making a horrible low pitched vibrating noise, which I said contradicted what the salesman had initially told me about the interior noise staying the same. The technicians initially tried to blame it on "dirt" in the blower which they had cleaned out and thereby changed the noise. We said, "Then please give us back our dirt." Then one of them said it was because our air vents and returns were obstructed and started going around trying to change how much the vents were blowing and telling us we had to move the things that were in front of the air returns! Obviously not since the vents and returns had been that way before the new AC without the noise. The technician said he'd have his manager call us to get someone out to check on the noise and fix the broken light and left. I went out to listen to the unit itself, and it wasn't noticeably quieter outside than our old one, either, just vibrating at a different frequency. It was audible all around our property just like the old one. 3 days later, 2 more technicians came out. They did seem to be trying to adjust the AC. The technician told me the blower speed had been set incorrectly initially, the pistons were incorrect and had to be changed, and the refrigerant levels were incorrect. I'm not sure if they changed the breaker again or not--the cord in the ceiling was disturbed, so they must have been working with the electricity in some way. The cabinet had been retaped to eliminate the air leakage. The light had been fixed, but the chain we'd had on it had been replaced with a cheap string (I guess the technician who broke it took the original metal chain with him?), so we cobbled together some shorter lengths of chain I had to make an acceptable pull chain. He said the floor mat was stained, and they would see about replacing it. I told him the noise was still there, and he said the blower speed had to be higher for this unit, and that was what was causing the noise. Probable translation: I don't hear what you hear, don't know what's making the noise, don't know how to fix it, and anyway, you'll "get used to it". No, I won't. It's a shame that we paid all this money for an AC that will be a constant irritation. If you're looking for a quiet AC, don't buy a Daikin! I feel that the salesman misrepresented or was not truly aware of the noise levels of the unit. I will say that the technicians were very professional and responded immediately to concerns, but ultimately, they couldn't fix the underlying problem. It's just a shame that AC technology hasn't advanced in 18 years and that the industry is putting out units that are actually noisier than they were in the past.