Check your thermostat first. Near the bottom of your thermostat, there ought to be a switch for the fan. There are two options for the switch: ON and AUTO. The fan will continuously circulate air throughout the house when it is in the on position. As a result, you might experience cold air coming from the vents. When the switch is set to the auto position, the fan won't turn on until the air has reached the proper temperature. In order to stop cool air from being fed into your home, make sure the thermostat's fan switch is set to auto.
Next, check the air filter. If you can't recall the last time you replaced the air filter in your furnace it's likely that the filter is too dirty for the furnace to function properly. The airflow over the heat exchanger can be obstructed by a dirty air filter, which will lead to overheating. The burners will then be turned off and the high-limit switch tripped for safety reasons at this point. In order to enhance indoor air quality and avoid furnace issues, make sure to change your air filter every month.