Quote:
Originally Posted by red-beard
Single Stage is on/off, standard system.
Two Stage, it starts up at about 65% and then switches to Full if the temp is more than two degrees off. More advanced system can also dehumidify by running low speed for a long time.
Variable Speed is like Two stage, except 40% to 110% capacity and very small increments. Even better humidity control.
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Two stage also has two compressors. Efficiency in mind of course.