Most HVAC systems are one-stage or single stage systems. These systems provide only one level of cooling or heating, at the maximum heating or cooling capacity. The thermostat controls the temperature in your house by turning the one-stage system on and off. During times when only a small amount of cooling is needed, your system will be on for 3 minutes and off for 15 minutes.
Single stage systems have only one operating capacity, on at 100%. Therefore, the thermostat simply adjusts demand by changing runtime. Therefore, a single stage system operating at 50% demand, runs 50% of the time.
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