Why Is My Furnace Blowing Cold Air?

November 12, 2019

It’s natural to panic when your furnace kicks on and you’re met with an unwelcome burst of cold air. Some homeowners immediately assume that their furnace is broken, and they worry that they’ll be left to shell out big bucks to have it replaced.

Don’t get ahead of yourself! A relatively minor problem or issue could be leading your furnace to blow out cold air. Before you start pricing out new furnaces, make sure it isn’t having issues due to one of the following problems.

The Furnace Hasn’t Had a Chance to Warm Up

The first bit of air that comes out of your vents will be on the colder side. A furnace needs a little bit of time to heat up and start dispersing the warm air.

Before you panic, let your furnace run for a minute and see if the air gradually begins to warm up.

Change the Settings On Your Thermostat

Your thermostat allows you to turn on your HVAC or select the “Auto” setting. When on auto mode, the fan will run and blow air, even when the furnace isn’t on. If you feel air coming out of your vents and it’s not warm, check to see if it’s simply the fan running.

The Pilot Light Went Out

Whether caused by a damaged component or gust of rogue wind, the pilot light on your furnace can occasionally go out. This means that your burner won’t ignite to heat up the air.

In this scenario, you need to relight the pilot or have it relit by a professional if you’re unable to do so safely.

Out of Fuel

If your furnace is powered by propane or oil and you’re not getting any warm air, check your fuel supply. If you’ve run out of fuel, you’ll have no heat source.

Dirty Air Filter

If you fail to change your air filter for long periods of time, it can get so dirty that it restricts airflow from your furnace to the air ducts. Check the air filter in your furnace. You might discover that all you need is a new filter to fix your problem.

If you still can’t get to the bottom of your furnace woes, call the team at Legacy Heating & Air Conditioning today. Licensed and trained HVAC professionals will be far more effective in diagnosing and addressing your furnace issues. We handle all heating and cooling services including installations, repairs, and tune-ups for customers in Louisville.

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