Why is my Furnace Blowing Cold Air?

Jan 23, 2018 | Furnace

Temperatures have been inconsistent this year. Maybe you’ve even turned your furnace off and on a few times. What happens when you turn it on again and it is blowing cold air? Or maybe it stopped working just when you started to need it most? There are a few reason that your furnace may be blowing cold air and there a few things to check before you need to worry too much. At B&C Mechanical, we are here to keep you warm and toasty this winter. If you are having problems with your furnace, check these things first and then call us for help.

Check your Thermostat

Make sure your thermostat is set on the correct setting. If it is set to “ON” the blower will run constantly even when the furnace isn’t heating any air. And the air that comes through the vents will seem cool because it is room temperature air. Turn your thermostat to “AUTO”, now the fan will only run when the furnace is heating and you won’t get tepid or room temperature air.

Change the Air Filter

A dirty air filter will cause your furnace to overheat. It restricts the air flow in and out of your furnace which can cause it to overheat. If it does overheat, the safety control will shut off the burners causing the fan to blow cool air versus heated air through the house.

Check the Pilot Light

Your furnace may be blowing cold air because the pilot light has gone out. It is a simple fix, just relight the pilot. If it continues to go out after you relight it a few times, then you should call us at or request service online. This is indicative of a bigger problem that requires professional help.

Reboot Your System

If you have a modern furnace, you probably have one that is controlled by a computer. Sometimes there is simply a glitch in the system and it needs a simple reset, the same way you would restart your computer or phone. If you turn off your furnace for 30 seconds and then back on, it may reset itself and begin functioning correctly. If it doesn’t start working the way it should after you have restarted the computer, call us today!


The older you ductwork is, the more likely it is to be damaged or leaky. If you have a damaged or leaky ductwork air can be escaping before it gets to the desired living areas. Inspect the ductwork yourself, but its possible that you may not be able to visually detect the rips or tears that are causing your leak.

If none of these work, you may be a bigger problem. Contact the professionals at B&C Mechanical today to diagnose and fix any problem you might be having.

Request service online today. B & C Mechanical provides commercial repair, replacement, installation, and maintenance services to residents in Kansas and Missouri. From Olathe to Kansas City, Blue Springs to Raytown, we are the #1 HVAC company in the area. Visit our service area page for the list of communities we serve. We service residents in areas surrounding these towns as well. If you don’t see your town listed, call us at 913-681-0088 and find out what we can do for you.

B & C Mechanical is proud to offer commercial heating and cooling services to residents in Kansas and Missouri. In Kansas, our service ares include Olathe, Overland Park, Leawood, Lenexa, Prairie Village, Shawnee, Merriam, Mission, Kansas City, Roeland Park, and surrounding communities. In Missouri, our service areas include Blue Springs, Gladstone, Grandview, Independence, Lees Summit, Liberty, North Kansas City, Raytown, South Kansas City, and surrounding communities. Call us now at 913-681-0088 or request service online.

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