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Why Is My Heater Blowing Cold Air?

What Causes a Furnace to Blow Cold Air?

When cold air is coming from your heater during the winter, we advise you not to panic. Before calling for service, there are ways to resolve this issue all by yourself. Some problems are typically minor, so we’ll address the most common causes.

If your heater is blowing cold air, try the following heater troubleshooting tips:

  • Wait a few minutes. Just like when hot water doesn’t immediately run through your faucet right after you turn it on, the newly heated air takes time to travel through your ducts. Whether it’s a gas furnace or electric heater, the heated air needs a few minutes to develop once it’s on. In any case, check how old your furnace is or how much insulation you have around your ducts to see if that may hasten the process.
  • Make sure your thermostat is set higher than your home temperature. If cold air continues to come out of your heater, then take a look at your thermostat. If it’s not set at a higher temperature than the one in your home, the unit will not turn on. Also verify if your thermostat relies on batteries if it’s not connected to central power. Interference with the thermostat’s connection with your heater may be an issue with a low battery.
  • Check the pilot light (gas furnaces only). Find out if your system’s pilot light is lit. If it’s unable to relight, then check on your fuel supply and see if your gas valve may have been inadvertently turned off. If you can’t determine if your furnace is receiving the proper gas supply, try turning on the gas stove to test it.
  • Reboot your heating system. If all else fails, lower the thermostat so that the heat setting is completely off and then disconnect the electricity from the unit. Wait for about 3-5 minutes before restoring the power.

If problems still persists, then it would be wise to seek professional help. Ensure your heater is ready for the winter by scheduling a maintenance checkup with one of our technicians at Phoenix Air Conditioning, LLC.


Contact our Palm Beach County heating service company today to schedule a service!


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