Why is Your Furnace Blowing Cold Air

Your furnace might be running just fine, but the air blowing out of your vents feels cold. Even if your furnace is fairly new, things can go wrong. It could be multiple issues, but in some cases, you may be able to fix the problem yourself. So before calling a professional for help, try these 3 furnace troubleshooting tactics.

Check the thermostat’s FAN setting

There are two settings on your thermostat to control the fan – AUTO or ON. Ensure your thermostat’s fan setting is set to AUTO, not ON. Keeping your fan on AUTO is the most energy-efficient option. The fan only runs when the system is on and not continuously.

Check the furnace’s air filter

A dirty air filter hinders air movement through the furnace and blocks airflow over the furnace’s heat exchanger. If you know-how, you can clean or replace the filter yourself, but it’s messy and not as easy as an air filter so you may want to leave this job to the pros.

Check the pilot light

If you have an older furnace with a continuous pilot light, the pilot may have gone out. The pilot light needs to be relit to burn fuel and heat your home. This could happen from a gust of air caused by someone working near the furnace.

If you have tried the above solutions but cold is still coming out of your vents, contacting a trusted expert.