Why is my furnace blowing cold air?

Is your furnace blowing cold air?

If your furnace is blowing cold air, we have tips to share with you!  Even being in southeastern North Carolina, it can get chilly during winter months (especially at night). So if your furnace is blowing cold air–getting is resolved can greatly improve your comfort. 

There are numerous possible causes for a furnace blowing cold air, so it’s often recommended to consult a certified HVAC contractor.  Some common causes that you can fix yourself include; thermostat settings, the pilot light being out, furnace overheating, and dirty air filters.

First things first, check your thermoset.

Is the fan set to “on”? If not, turn your thermostat’s fan setting to “auto”. Now your furnace should blow warm again. 

Is the pilot light out?

If you have a gas furnace and the pilot light is out, it often causes the furnace to blow only cold air. You can try relighting it. If the problem continues, check the gas valve to ensure it’s on. If the pilot light continues to go out, you may need to check the thermocouple (the copper rod attached). It might need to be adjusted or even replaced. If you are unsure how to do this, contact a professional HVAC contractor for help. 

Is your furnace blowing warm air but sporadically blowing cold air?

This is a good indication that your furnace is overheating. Check your furnace air filter. If it’s dirty it may cause your furnace to work harder than normal. Once you change the air filter it should stop blowing cold air. If your furnace continues to overheat, have your furnace checked promptly. Ignoring an overheating furnace can lead to extensive system damage. 

If you are still experiencing problems after troubleshooting yourself, contact our professionals at All In One Services. We have been providing exceptional services to the Wilmington area for over 25 years. Even if you need us in the middle of the night, we never charge extra. We want to help keep our customers warm in winter months and cool during the summer. 


What our customers say...

I purchased the special spring tune up offer from All In One for both of our HVAC systems. They promptly called to schedule the visit, showed up on time, and did an excellent job performing the work. The technician fixed a loud rattling noise that was coming from one of the fan units (turned out to be the fan hitting a wire housing when it would turn on and off), added Freon to one unit and no additional expense was required. He placed shoe covers on when entering the house to keep things clean, and communicated well what he had done and his assessment of things at the end of the visit. Thankfully, everything look good. They also provide a 30 day warranty on your entire HVAC unit after performing the tune-up. I will definitely be using All In One for our HVAC needs going forward.