Quote:
Originally Posted by New Englander
Hi, what is a dual stage?
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Basically, there are 3 types of AC units: one stage, two stage, and variable speed, with variable speed being the most expensive. With the two stage and variable speed units, the compressor can operate at different levels of cooling. However, I don't think most people will notice the difference among the different units cooling ability, or the energy savings. And, multi speed AC units have never seemed to catch on as a standard product in single family houses. The majority of AC units sold are one stage units. If I were buying a new system, I would purchase a one stage unit.