Get the variable speed trane. Carrier's is more complicated with more parts. Trane has accomplished variable speed with minimal parts. Trane's reliablity is the best in the industry. I have a degree in Energy Engineering and have been involved with the HVAC industry 20 years. Get the 10 year optional waranty from Trane as a safe gard. Excellent energy efficiency, comfort, and quiet, can't be beat
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