![]() They typically can run at 40% to 100% capacity and vary the speed in increments of less than 1%. They are costly to buy and repair and are more likely to break down than other compressors. Variable-speed Compressor: Variable-speed, also known as modulating, compressors are the most expensive but the most efficient.Two-stage compressors are quieter when running at low speed. Running at a lower rate for a more extended time cools the house more evenly, removes humidity better, produces better air quality, and consumes less energy. They are efficient because they usually run at low speed, typically about 70% capacity, for a longer time. They cost more than single-stage compressors to buy and repair and are less likely to break than variable-speed compressors. Two-stage: Two-stage compressors are “middle of the road” in terms of cost and efficiency.Single-stage compressors are noisier than the other types because they always run at full speed. Working at full speed means they shut on and off frequently, leading to cold and hot spots in the home, less humidity removed from the air, poor air quality, and more energy consumed. ![]() Single-stage compressors have one speed and always operate at 100% capacity.
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