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We rely on our furnace to keep us warm during the cold winter months and when our furnace isn’t working properly, it can be quite alarming! A common complaint people have about their heating system is feeling cold air blowing out of their vents when the heat is turned on. If you start to notice that your furnace is blowing out cold air, don’t panic! Here a few things that you’ll want to check before calling in a professional:

Turn of the fan. Is your furnace blowing hot air at times and other times cold air? It’s likely that your thermostat fan is set to ON. This means that even when the heater isn’t running, your furnace blower will continue to blow air through the vents. Since it’s pretty chilly outside, the air that’s going to circulate will also be cold! Make sure to set your thermostat fan to AUTO to prevent this problem.

Your furnace overheated. If the air coming from your vents has gone from hot to cold, it’s possible that your furnace has overheated. Usually an overheated furnace is caused by a dirty furnace air filter. Change the air filter and turn the furnace back on to see if this fixes the problem. Keep in mind that changing your air filter regularly will help your furnace run more efficiently.

The pilot light is out. Another reason your furnace may be blowing cold air is because the pilot light has gone out. Relighting the pilot light should be all you need to restore warm air flow to your home! If the pilot light doesn’t light or won’t stay lit, there may be a problem with gas flow or thermocouple. Ensure that the gas valve is turned on and that nothing is blocking it.

If you’ve tried the solutions described above and your furnace is STILL blowing cold air, contact us today for an inspection!

2 Responses to “Why is My Furnace Blowing Cold Air?”

  1. Eliza Cranston

    Thanks for explaining why my furnace may be blowing cold air! I’ve noticed recently that the air coming from the vents is cool, and I wasn’t sure what the problem was. My thermostat isn’t set to ON, so maybe my furnace has overheated or the pilot light has gone out. I’ll call someone to come take a look at it.

    Reply
  2. Luke Yancey

    My furnace has been blowing the hot and cold air out. Thank you for telling me to check whether the fan is set to ON. I just checked and switched it to AUTO. It seems to be working a lot better now. Thanks!

    Reply

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