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The only other advice I can provide is the quality of the installer for the system. Most AC systems today are made with some pretty good manufacturing methods. Meaning they are all about the same. Sure some that cost more will have better efficiency ratings and some will be more quite then others, but you can get the most expensive system made and have someone who does not do the install correctly and it will turn out to be the biggest piece of junk you ever bought. The quality of the install is very important. So be sure to look into experience of the contractor doing the job.