Why Is My Furnace Blowing Cold Air?
Furnace blowing cold air? If your furnace is blowing cold air, it might be because of a problem with the thermostat, a dirty air filter, a pilot light issue, or a problem with the gas supply. A gas furnace can have various issues leading to it blowing cold air, such as low gas supply, malfunctioning components like the pilot light and flame sensor, or fuel supply problems.
In the following text, we will delve deeper into the reasons why your furnace blows cold air and discuss potential solutions to make your furnace blow warm air like it is supposed to. Hence, if you would like to know more on the topic, keep reading.
Wrong Thermostat Setting
If your thermostat is set wrong, it can blow cold air. For example, if it’s set lower than the current room temp, it will kick in and blow cold air before it reaches the desired temp. Incorrect thermostat settings can also affect the heating cycle, causing the furnace to blow cold air if not set correctly. Or if it’s set to cool instead of heat, it will blow cold air instead of warm air.
Or a bad thermostat can send the wrong signal to the furnace and blow cold air instead of warm air. Hence, it is essential that you check this factor before moving on to anything else, as you may have to pay unnecessary fees if the wrong thermostat settings are causing you problems. Hence, it is important to learn how to program your thermostat the right way.
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Dirty Air Filter
When the air filter is dirty, it becomes clogged with dust, debris, and other particles. This restricts the airflow, causing the furnace to overheat. In response, the furnace’s safety mechanism may trigger, leading to the circulation of unheated air throughout your home.
Additionally, if the air filter is clogged, it can hinder the flow of cool air, leading to the furnace blowing cold air instead of warm air. Regularly replacing or cleaning the air filter in your furnace is essential to maintain proper airflow and ensure efficient heating. Learn more about air balancing by clicking here.
Checking the Pilot Light
When your furnace is blowing cold air, check the pilot light first. A pilot light that’s out will prevent the furnace from making heat. Issues with the pilot light assembly can also prevent the furnace from making heat. If you find the pilot light is out you can try to relight it according to the manufacturer’s instructions.
But if the pilot light won’t stay lit or relighting it doesn’t fix the issue, then there’s a bigger problem, and you should call a qualified HVAC tech to diagnose and fix it. If you would like a reliable HVAC service, you can reach out to Green Street HVAC.
Circuit Breaker Issues
Circuit breakers can cause your furnace to blow cold air in two ways. If the circuit breaker is tripping repeatedly, it cuts off power to the furnace while it’s running, causing it to blow cold air. Issues with the gas valve can also cause the furnace to blow cold air. If a faulty circuit breaker is not providing consistent power to the heating elements, the furnace will not heat properly and will blow cold air.
It’s important to get circuit breaker issues fixed as soon as possible to ensure your furnace heats properly. If you would like help with your furnace circuit breaker, you can reach out to us for help.
Blower Motor
If your furnace is blowing cold air, it may be due to a faulty blower motor. A dirty or faulty flame sensor can also cause the furnace to shut down and blow cold air. It could be the motor, the fan belt, or the thermostat. To fix this, you’ll need to check the motor and fan belt for damage and the thermostat to see if it’s working correctly. If you’re not comfortable doing that, call a professional HVAC tech to diagnose and fix it.
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Ductwork Issues
Ductwork issues can cause your furnace to blow cold air for many reasons. If there are leaks or gaps in the ductwork, cold air from unheated spaces can mix with the heated air and drop the temperature as it hits the registers. If there are blockages in the ductwork from debris or objects, it will restrict the flow of warm air, and not enough heated air will get into the living spaces. Hence, it is important that you clean the ducts regularly.Â
Moreover, if the ducts are sized or designed incorrectly, it will cause inconsistent heating throughout the house and manifest as cold air coming from the furnace. So ductwork issues like leaks, blockages, and design flaws need to be addressed so that the heated air from the furnace gets to the living spaces without being compromised.
Frequently Asked Questions
If your furnace is blowing cold air, it could be the pilot light, thermostat, or heating element. Check these out and call a pro if you can’t figure it out.
 If your furnace is running but not producing heat, the problem could be the thermocouple, gas supply, or heating element. Check these out and call a pro if necessary.
A furnace that does not blow warm air could have a clogged air filter, a bad fan motor, or a problem with the heating element. Try replacing the air filter and checking the fan and heating element, or call a pro to have it looked at.
 If your furnace is working but your house is cold, it could be due to poor insulation, leaky ducts, or an undersized furnace. Check your insulation, inspect the ducts, and make sure your furnace is the right size for your home. If that doesn’t fix it, you may need to call a pro.
Common causes of a heater blowing cold air include a dirty air filter, a malfunctioning fan limit switch, and leaking air ducts. A dirty air filter can restrict airflow, while a faulty fan limit switch can prevent the fan from operating correctly.
Leaking air ducts can cause warm air to escape before it reaches your living spaces. Check and replace the air filter, inspect the fan limit switch, and seal any duct leaks to resolve these issues. If the problem persists, contact a professional for further assistance.
Get Quality HVAC Services At Green Street HVAC
If you would like a quality furnace service to restore the function of your furnace, you can reach out to us at Green Street HVAC. We offer many services, including duct cleaning, ductwork repair, furnace installation, and more! Contact us today and learn more about our services.
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