Also wanted to share our experience.
We have installed 3 ACs for the same house for the past 24 years. The first AC we installed was Carrier (a very good one). We bought a good AC, but then we got a bad company to install the AC. Our Carrier was broken after 2 years. Then they replaced our Carrier with another AC (for extra $900).
Another 3 years later, the replaced AC was broken again (leakage in pipe).
We then installed the third AC (Lenox) from Service Expert (now is called Francis Home) in Year 2000. Our AC has leak again.
Our technical advised us to get a new one rather than fixing it (it will cost more to fix it). I suspect that the leak for our AC was due to the original installation by the first company.
So, to make the story short. Make sure you get a good company to install your AC. Even you have a good AC, it will cause you problem down the road.
Find a reputable company to install your AC! This is my advice.