Yep, that is pretty much it. I had a two-speed compressor system, with variable speed air handler and 4 zones, in a previous home (Carrier Infinity was two-speed Bristol compressor). It worked great. Most of the time it ran at half speed. The advantages are efficiency and better humidity control. With a single speed compressor, the system will cycle on and off. With a two speed, or variable speed compressor, you will have much longer runtimes in low speed. It is easier on the compressor to run continuously as opposed to cycling on and off. Also, cycling on and off is less efficient than running continuously in low speed.
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Originally Posted by anothersteve
Basically the compressor has a high and low. It usually runs on low on mild days, unless the temps outside call for more cooling inside, then it runs high. More efficient
One stage just runs at one setting, less efficient
At least that's with my limited knowledge
Steve
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