As the cooler temperatures arrive in St. Simons Island, GA, we all rely on our heating systems to stay warm and cozy. If your furnace is blowing cold air instead of warm, you may have a problem with one of the following parts of your system.
Thermostat
If you’ve accidentally set your thermostat to “fan” rather than “auto,” it may tell your blower, not your burner, to turn on. Also, setting the thermostat too low and keeping it on “cool” instead of “heat” can cause cool air to come from your vents. If you make the necessary adjustments and still don’t have heat, ask an HVAC professional to inspect your thermostat and ensure that it’s properly calibrated to your system.
Airflow
An air filter that’s dirty can reduce airflow, making the furnace work harder to heat your home. This extra stress can lead to overheating, a situation that it may respond to by shutting down temporarily. The blower may still function at this point, but it will only circulate cool air.
Pilot Light
Many older furnaces rely on pilot lights to ignite their burners and start the heating process. If the pilot light goes out because of a draft, a broken component or debris interfering with the flow of air, the furnace will not generate heat.
Limit Switch
The limit switch helps regulate the temperature inside the furnace, signaling it to stop generating heat if it gets too hot internally. If the limit switch malfunctions, it might signal the furnace to stop heating at the wrong time, causing the blower to circulate cool air through your home.
Several faulty parts, such as the thermostat, air filter, pilot light or limit switch, could result in your furnace blowing cool air. A technician can determine the source of your problem and come up with a solution. Contact The A/C Guys to set up a furnace repair appointment.
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