Why Is Your Furnace Blowing Cold Air?


When your furnace blows cold air, chilly outdoor conditions can develop indoors. If you’re feeling cold indoors and no amount of air from your furnace seems to be doing the trick, then your furnace may simply be blowing cold air. Furnace repair experts have found that the following problems can cause this common furnace complaint.

Thermostat Set Incorrectly

You may have the wrong setting on your thermostat. First of all, make sure that your system is set to  circulate heat, not cold air. This is a common mistake people make in the spring and fall, when hot and cold days may alternate, or when warm days are followed by cold nights. If your furnace is set to heat, then look at the fan setting. Is is set to “Auto” or “On”? Setting your fan to “On” means that your fan is circulating air constantly. This doesn’t mean that you’ll get a constant stream of hot air, though. Rather, the fan blower will circulate air regardless of its temperature.

Your furnace doesn’t produce constant heat. It takes periods of rest between generating warm air. So if you happen to feel cool air coming out of your vents, your blower may just be circulating untreated air. Switch your thermostat to “Auto” and your system will only circulate air when the furnace produces warmth.

The Pilot Light Is Off

If you have an older furnace that depends on a pilot light, this light may go off, which renders your outdated furnace incapable of producing heat. Inspect your furnace. Is the light on? Ask a home furnace repair team for help locating the pilot light if you don’t know where it would normally be lit.

If it’s off, then you should power off the furnace, set it to “Off” on your thermostat, and reset the pilot light assembly to turn the light on. Note that you may have to partially disassemble your furnace to access the light assembly. Feel free to call professional furnace repair in Pittsburgh, PA, if you don’t feel comfortable doing so. You’ll need to turn the pilot light knob to “Off”, and then wait a few minutes. Turn the knob to pilot and press it inward, then light it with a lighter or match. The pilot light should catch. Carefully turn the knob to “On” and the furnace should begin producing heat. Go back to your thermostat and turn the furnace on.

Other Issues

There may be issues with the blower in your furnace, the condensate line, your fuel source, and more. The best way to determine why your furnace is blowing cold air is to call for professional furnace repair in Pittsburgh PA.


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