Two-stage heating and cooling is considered to be more efficient, because it operates at a low, energy-saving speed most of the time. However, on days when more heating or cooling is required, it switches to the next stage for maximum comfort.
Energy efficiency standards for HVAC systems set by the U.S. government to help reduce energy costs and protect the environment.
A two-unit HVAC system, with one unit located outside the home and the other inside the home, that typically fulfills both heating and cooling needs.
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