Green Leaf Air

by Rifat A. in Blog 0 comment

A furnace is an integral part of any house, especially in winter. In winter you want your furnace to function properly. But because of lack of maintenance and other technical faults, your furnace can blow cold air. There’s nothing more devastating than when your furnace blows cold air during winter. This problem can happen to newly bought furnaces as well. There can be many reasons behind this problem and some of which you can fix yourself, and these DIY repairs are very easy to do. In this article, I’ll talk about a few reasons why your furnace is blowing cold air instead of hot air.


4 Reasons Why Your Furnace Is Blowing Cold Air and How to Repair It

1.    Your Thermostat is Turned On

This is a common problem in all the houses. But the good news is you can fix this problem by yourself. If you mistakenly turned on your thermostat setting, your furnace will blow cold air because when the thermostat setting is on, the furnace blower will constantly run whether the furnace is heating the air or not. As a result, you’ll get cold air instead of hot air. This problem doesn’t require any fix or change in any parts.

The solution to this problem is easy, and you need to set the thermostat settings from ON to AUTO. When you set your thermostat settings to auto mode, your furnace fan will only rotate when the heating cycle is on; otherwise, the fans won’t rotate. It also means that when the thermostat is set to auto, your furnace fan will stop rotating when the furnace reaches the desired temperature.

2.    Furnace Fuel is Low or Out of Fuel

A furnace runs on fuel. Fuel can be gas or oil. Both the oil furnace and gas furnace have their own advantages, but I won’t discuss that today. However, if your furnace tank is empty, your furnace will blow cold air. Due to the mechanism of a furnace, your blower will continuously circulate, and as a result, you will get cold air instead of hot air.

The solution to this problem is also very easy. When you see your furnace is blowing cold air, look at the fuel meter. If it is at a low level, refill the fuel tank.

3.    Furnace Ignition isn’t Functioning

If your gas furnace is not producing hot air, there may be a problem in your ignition system. This is a common problem for those who have an old furnace. When your furnace ignition isn’t functioning properly, your gas furnace cannot light the fuel, and because of that, it cannot blow hot air. There’re few ways of checking whether you have a furnace ignition problem or not. You can confirm this problem with the following steps:

At first, check the manual book on how to ignite your model’s pilot light. Then relight the furnace pilot light. If the flame stays on, your furnace is alright, but if it doesn’t, you may have a thermocouple problem. The thermocouple is a safety device that is installed in a furnace. It turns off the gas supply when the pilot light of the furnace goes off.

When you find out that you have a furnace ignition problem, you need to change your thermocouple. A faulty thermocouple can turn off the gas supply, and because of that, your furnace will blow cold air instead of having fuel in the furnace. While changing the thermocouple of your furnace, you should call an HVAC professional to your home. There’s plenty of expert HVAC professionals in Dallas. If you don’t feel like changing the thermocouple by yourself, you can rely on the expert HVAC professionals of Dallas.

4.    Restricted Airflow Because of Dirty Air Filter

If your air filter is dirty, your furnace can blow cold air. A dirty air filter restricts the airflow of your furnace. Restricted airflow causes overheating. When your furnace overheats, due to the mechanism of the furnace, it will blow cold air.

The only solution to this problem is changing the air filter regularly. As Dallas is one of the polluted cities in the US, you may have to change the air filter quite often. You can change the air filter every 70 to 90 days, depending on the location you live in Dallas. For any AC Repair and Maintenance work in Dallas, feel free to call Green Leaf Air.


See the summary of this article here – 4 Reasons Why Your Furnace Is Blowing Cold Air [Infographic]


4 Reasons Why Your Furnace Is Blowing Cold Air
4 Reasons Why Your Furnace Is Blowing Cold Air


By the way, are you looking for an HVAC system for your home?

Check out Green Leaf Air Store where we have a wide range of residential & commercial HVAC system including: –

Complete Goodman HVAC SystemHeat PumpsTrane HVAC systemAir HandlersGas Furnaces

Besides, for any AC installation, AC replacement and AC repair services, call Green Leaf Air to ensure you get the best quotes and satisfying service.

Rifat A.

HVAC Expert, Author & Mathematician... rifatahmed.com

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