2-speed or Not 2-speed, That is the Question:
Most air conditioning manufacturers offer 2-speed compressors in their heat pump units. The advantage of the 2-speed compressor is that it adjusts to the demand of the temperature in the house. IN extremely hot weather the compressor runs on high speed and full capacity. In milder weather the unit runs on low-speed at partial capacity. By running on partial capacity, operation costs are less and the system provides better humidity removal. If you are buying new air conditioning system a 2-speed unit may be right for you.