Why Is Cold Air Coming Out When the Heat Is On?

While the Waco, TX area doesn’t get as cold as other areas throughout the country, the winter days can still reach 30°F or even lower. Days like these require a high-functioning heating system in order to protect your home and keep your loved ones safe and comfortable. But when you notice cold air blowing from your vents, even though the heat is on, what can you do to restore heat and keep your home warm?

In our latest blog post, Evergreen Heating and Air takes a look at some of the reasons why you might notice cold air blowing, despite your heating system being on. Contact our team today to learn more or to schedule an appointment for heating services throughout the Waco, TX area.

A Clogged Air Filter

Heating systems use air filters in order to catch any contaminants that might threaten the home’s air quality. As time goes on and the system is used more frequently, these filters will become clogged with dirt, dust, and other debris that they’ve pulled from your home’s air supply.

A dirty air filter will cause your furnace to work harder than it would otherwise need to, which can lead to the system overheating. If this happens, the system will shut down and won’t be able to produce warm air. However, air will continue to flow throughout your home, leading to you feeling cool air blowing from your air vents.

If you haven’t replaced your air filter in months, replacing the filter is an easy and inexpensive way to potentially restore heat to your home.

Incorrect Thermostat Setting

Sometimes, user error can be the main culprit if your furnace is blowing cold air. To see warm and effective temperatures, your thermostat should always be set to “AUTO” rather than “ON”. A thermostat that is set to “ON” will recirculate cold air, as the system will continue to run even when the furnace isn’t producing heat.

Setting your system to “AUTO”, on the other hand, ensures that the system will only run when a new heating cycle is required to maintain your home’s temperature. Not only does this ensure you’ll only feel warm air leaving your vents, but it also keeps energy bills lower, as your blower motor won’t be constantly running like it does when the system is set to “ON”.

Flame Sensor is Dirty

Your system’s flame sensor helps to protect your home from dangerous gas leaks. Essentially, it will detect whether or not there is an active flame within the furnace. If it doesn’t detect a flame, it will shut the furnace off in order to prevent a gas leak.

When the flame sensor gets dirty, it won’t be able to properly detect whether or not there is an active flame, which can prevent your system from producing and blowing hot air. Have your system inspected and your flame sensor properly cleaned by a professional to restore heat to your home.

The Pilot Light is Out

Older furnaces utilize pilot lights as an ignition source to help heat your home. A pilot light is a small flame within the system, and if it goes out, it will need to be reignited to continue providing your home with warm temperatures. The system’s manual can help you figure out how to reignite the flame.

If the flame goes out once again after you’ve reignited the pilot light, contact Evergreen for assistance. A pilot light that continues to go out is likely a sign of larger issues.

Contact Evergreen for Heating Services in the Waco, TX Area

Is your furnace blowing cold air? If so, reach out to Evergreen. Residents of Waco, TX, and the surrounding area can count on Evergreen Heating and Air for heating repair, installation, and maintenance services. We’re proud to be among the most trusted companies in the area, and we’ll work hard to get to the bottom of your heating and cooling issues.

Contact us today to learn more about our services or to schedule an appointment with our experienced and knowledgeable team.

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401 S 13th St,
Waco, TX 76706





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