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Ensure that your thermostat is properly set / programmed, and that the batteries do not need replacement.
Check that your filter is clean enough to provide sufficient airflow and
confirm that there is power supplied to the unit.
It is recommended that both your heating and cooling systems be serviced annually.
Yearly maintenance of your heating and cooling system can prolong the life of your equipment, and help avoid unnecessary breakdowns.
Improving airflow through the air handler, and through the coils associated with your cooling system will help with the efficiency during cooling season.