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I can only comment on Trane....they are freaking JUNK. We put a new one in our office building a little less than 4 years ago and thecompany that sold it to us has been there every year twice a year to work on it.
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I don't know the entire situation but a lot of the issues I find, with any brand out there, is poor instillation.
If things like airflow, ventilation, intake, clean refrigeration practices, proper equipment sizing, proper refrigerant charging, gas pipe sizing, etc... Are not followed, it leads to multiple issues, service calls, and pissed off customers. It's not real common to have multiple issues with a new unit unless you have a larger common issue. I would strongly suggest hiring a different contractor and getting a second opinion on your system.
It could be just a bad unit out of the box, but it is really really really rare.