The thermostat is technically as simple device when comes to controlling your HVAC equipment. For AC Cooling thermostat evaluates the temperature set point versus the ambient room temperature. If the ambient room temperature is higher than the set point, the thermostat initiates a call for cooling. To do this the thermostat connect the R or Rc to the Y/Y1. This sends the input power (R) down the Y wire to the indoor air handler. The air handler will turn on the blower fan, and Y wire is cross-connected to a wire going to the outdoor condenser unit and this will start the compressor. When the thermostats ambient temperature matches the set point, it deactivates the call for cooling by internally disconnecting R from Y. Now most air handlers will keep the blower fan running for an additional minute or two. Now, if your system is cycling before the set point is reached, this indicates a problem with your outdoor condensing unit. If the outdoor unit detects Low or High refrigerant pressure, the safety system deactivates the compressor to prevent damage.
Perhaps you need to call an HVAC company to come bay and tune your system up and provide a system cleaning.
The AC Cooling Wizard
NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
