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Why Is My Heater Blowing Cold Air?

When it’s time to kick up the heat, the last thing you want is to be greeted by an arctic blast. Why would a heater blow cold air, anyway?

The reality: this happens more than you may realize. There’s usually a simple reason behind it, one that your trusted HVAC professional can diagnose and fix it fairly quickly. Here are a few reasons why this could happen:

The Air Filter is Dirty

If your heater is blowing cold air, it could be because of a dirty air filter. A dirty air filter can restrict airflow and cause your heater to overheat. When your heater overheats, it will shut off and stop blowing hot air. To avoid this, check your air filter monthly and replace it if it’s dirty.

The Pilot Light is Damaged

If your heater is blowing cold air, it could be because the pilot light is damaged. When the pilot light is damaged, it doesn’t heat up the gas as much as it should. This causes the gas to cool down before it gets to the burner. As a result, the air that the heater blows is also cooler than it should be.

There are a few things that can cause the pilot light to become damaged. One is if there is a draft in the room where the heater is located. This can cause the flame to flicker and go out.

Another thing that can damage the pilot light is if it gets wet. Water can extinguish the flame, and over time, this can damage the element inside the pilot light.

There’s Buildup on the Flame Detector

A buildup of soot and dirt on your home’s flame detector could be the reason your heater is blowing cold air.

If there’s a problem with the flame sensor, the furnace may not ignite the gas to produce heat, or may shut off prematurely thinking there’s a fire, leaving your home cold.

To clean the flame sensor, turn off the power to the furnace at the breaker box and then use a cotton swab dipped in rubbing alcohol to clean any debris from the sensor. Allow it to dry completely before turning the power back on and testing the furnace.

There May Be an Issue in the Gas Supply Line

If you have a gas heater, chances are your home’s heating system is powered by a natural gas supply line. This line brings gas into your home from the street, and it powers not only your heater, but also your stove, water heater, and any other appliances that use natural gas.

Unfortunately, this gas supply line can sometimes cause your heater to blow cold air. This happens when the line becomes clogged or damaged and disrupts the flow of gas into your home. When this happens, your heater won’t be able to function properly and will blow cold air instead of heat.

Your Thermostat Might Have the Wrong Settings

Iif your thermostat is set too low, your heater may blow cold air. The thermostat could be set below the heating system’s minimum temperature. This means that the heater will turn off once it reaches that temperature, even if the room isn’t warm yet.

The thermostat could be set too close to a window. If there’s a draft coming in from the window, it can cool down the sensor and make the heater think that the room is already warm enough.

It’s the First Time You’ve Fired Up the Furnace

When you first turn on your heater for the season, the air that comes out may be cooler than you expect. The most common reason is that the furnace has been sitting idle all summer and needs to “wake up” again. Once the furnace gets going, the air will warm up quickly.

Troubleshooting Furnace Issues with Confidence

If your heater isn’t giving you warm fall vibes, it might be time to call a professional. Contact us today and let us help you heat your home before freezing temperatures arrive!

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