Why is My Furnace Blowing Cold Air?

  1. Check Thermostat
    If your thermostat is set to the ON position then it will be running constantly which means it will blow cold air when it’s not heating the air. Instead, switch the thermostat to AUTO.
    Other issues with the thermostat could be that if you installed it yourself with no professional help then you may have installed the wrong thermostat for your heating system. Your thermostat may also just need it’s batteries changed.
  2. Empty Oil Tank
    If you have an oil furnace, then you may be out of fuel if it’s blowing cold air.
  3. Furnace Overheated
    Check to see if your furnaces air filter is dirty. When the filter is dirty it prevents airflow causing your furnace to run longer until it overheats.
  4. Pilot Light is Out
    If your gas furnace is blowing cold air then check to see if the pilot went out. Relight the pilot and if it stays lit then you’re good to go!
    But if it won’t light at all then check to see if the gas valve is switched on. If the switch is on, then the pilot light may need to be cleaned.
    If the pilot light will light but won’t stay lit then there’s a problem with the thermocouple and your furnace will need professional HVAC maintenance to adjust or replace the thermocouple.

    If your furnace is having problems, feel free to call us today for one of our HVAC technicians to help! Our number is 814-266-8605

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