Why is My Gas Furnace Blowing Cold Air?

November 13, 2018

As the weather changes, the more you feel the cool air blustering outside. And … in your home? If your gas furnace is blowing cold air and adding a chill to your San Jose home, it’s time to call American HVAC Inc. Once in a while an absence of warm air from your gas furnace means a big repair, but often it can be a simple fix. Here are several reasons your gas furnace might be blowing cold air instead of keeping your home toasty.

Your furnace may be overheating

If you haven’t had ongoing maintenance done on your gas furnace for some time and you’ve overlooked changing your air filter, either could signal why your furnace is blowing colder air. A dirty air filter can prevent air from flowing freely through your furnace. When this happens, the furnace could overheat and cause the burner to shut down.

Your pilot light may have gone out

Sometimes a lack of warm air from your gas furnace can be attributed to something as simple as a pilot light that’s gone out. It’s possible, particularly with older furnaces, for a draft to put out a pilot light. Other reasons for an extinguished pilot light are defective gas valves or a faulty thermocouple.

Your furnace is dirty

Just as a dirty air filter can mean problems for your gas furnace, so can other furnace components if they aren’t appropriately cleaned. A dirty gas burner or flame sensor could cause your furnace to struggle to stay lit and reduce the warmth inside your house.

Your ducts may not be properly sealed

When ducts are correctly sealed or if they have any cracks or holes in them, you could be losing a lot of heated air before it even reaches the vents throughout the home.

No matter what the culprit of the problem is, American HVAC Inc in San Jose can help you get your gas furnace up and working at an efficient level again. We can also help keep it running with regular, preventive maintenance. Call our experts at 408-215-1018 or book an appointment with us online and we’ll be there to help.