We changed out our central ac a few years ago to an Airtemp unit that has a scroll compressor. They are very efficient. The old unit was a Trane with a rotary compressor. Our electric bill is half of what it was and the unit cools better. This is without the complications of a multi stage or variable system. The ac expert told me that the super high efficiency systems rarely achieve the rated seer and they are much more susceptible to break downs
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