When you finally turn on your furnace on a chilly day, there’s nothing worse than being greeted by a cold breeze. If you’re experiencing a furnace blowing cold air, check out these four common issues. Have one of our expert technicians diagnose your system’s issues by giving us a call for heating repair here in McComb, MS.

If you have a furnace blowing cold air, it could indicate there is an issue with the settings on your thermostat. Call our team for heating repair this winter.

If you have a furnace blowing cold air, it could indicate there is an issue with the settings on your thermostat. Call our team for heating repair this winter.

An improper thermostat fan setting

One simple fix is to check your thermostat. Your thermostat should have two button or switch options. The first one switches from your furnace to air conditioner, while the second turns your fan to “on” or “auto.”

Your fan should be set to “auto.” This turns on the blower whenever your furnace or air conditioner is on, but otherwise lets it rest. Turning your fan to “on” causes your blower to blow out air constantly. Without the furnace, this air will feel cool in the winter.

Your furnace is still warming up

Modern furnaces are surprisingly efficient at heating an entire home. However, it still takes a few minutes for your furnace to heat up to full power. At Southern Air Heating, Cooling & Plumbing, we speak with many homeowners who are concerned with this warming-up period.

Your furnace will blow out cool air for just a few minutes, then it should increase the temperature. The process is like your hot water faucet, which produces cold water until your hot water reaches your faucet.

If your furnace still doesn’t produce warm air after a few minutes, it may be a sign of another issue. Check another common cause or contact our team for more information and assistance. There may be an electrical, mechanical or gas issue with your furnace that requires professional servicing.

Dirt on your flame sensor

Old furnaces use a pilot light to keep the flame ignited. Modern furnaces use an electric igniter, which is more energy efficient and safe. However, these ignition systems rely on a flame sensor to monitor your furnace operation.

A dirty sensor prevents the system from determining whether it needs to ignite or not. This will prevent your furnace from heating up. Finding the flame sensor can be tricky. If you aren’t familiar with your furnace, work with a professional to avoid damaging your furnace or risking electrocution.

A clogged air filter

Finally, another common issue that you can solve on your own is a dirty filter. A dirty air filter blocks much of the airflow from your furnace to your vents. At first, this will simply increase the time it takes to warm up your home.

Over time, however, it will cause your furnace to overheat and cease to provide hot air. Your blower may still keep forcing air through your vents, but the air will now be cold. Remove and replace your air filter to restore your hot air.

Work with Southern Air to address your furnace repair needs this winter

There are many issues that could lead to a furnace blowing cold air. If you’ve tried these steps or believe the problem is more serious, don’t hesitate to contact us at Southern Air Heating, Cooling & Plumbing. Work with a leader in comfort to restore warm air to your home.