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Gas furnace in Vaughan, Ontario

No homeowner wants to arrive home from the office or work to find out that their furnace is not heating the house. Why is my furnace blowing cold air? Many individuals end up confused and wondering why their furnace won’t heat the home adequately

Fortunately, you can troubleshoot the furnace and solve the problem if it’s a straightforward breakdown. Therefore, you should consider the following easy fixes first before calling HVAC technicians for assistance.

Reasons Why Your Furnace Is Blowing Cold Air

If your furnace is blowing cold air, there are some things you can try before contacting an HVAC Professional. At this moment, we will take you through a few reasons that might alter your furnace’s heating system. Let’s delve into it:

Improper thermostat configuration

If several family members occupy your home, you might be experiencing ‘thermostat wars’ in the house. These disagreements mean that some individuals might change the thermostat setting in their favour. Someone might have switched the thermostat from AUTO to ‘ON.’ 

Leaving the thermostat setting ‘ON’ will keep the furnace blower ‘ON’ and blowing even when your furnace is not heating air. Turn the setting back to AUTO to bring your furnace’s performance back to normal. 

An overheated furnace

The overall heating in your furnace mainly happens in the heat exchanger. If your heat exchanger overheats, the system will switch the burners off immediately. 

It will, however, leave your blowers running, thus causing your furnace to keep blowing cold air. The blowers will help cool your furnace down. An overheating furnace might be a result of a damaged or clogged air filter. 

Inadequate gas supply

If your furnace is ‘ON’ and your thermostat setting is correct, there may be a problem with the gas supply. Your furnace requires an adequate gas supply so that the burners remain efficient. 

A clogged filter

A blocked air filter is a problem for your furnace or air conditioning system. If dirt, dust, and debris accumulate in your filter, it restricts the amount of airflow coming into your furnace. The air filter clog results in overheating, thus leading to breakdowns. If your filter is clogged, you might have to clean it or replace it with a new one. 

If the pilot light is off

Without a pilot light, the furnace won’t heat your home. We advise you to read through your manufacturer’s manual to relight the pilot light safely. However, call an expert if the issue seems complex. 

A dirty flame sensor

Furnaces that don’t have a pilot light ignitor have a flame sensor that ensures your furnace keeps burning after ignition. If your furnace’s flame sensor is clogged, the furnace may start blowing cold air. Clean the flame sensor or contact a professional if the task seems challenging. 

Thermostat problems

The thermostat is the fundamental cause of random breakdowns. If your furnace is blowing cold air, check the thermostat. If your thermostat is not adaptable to your furnace, your heating system might fail to heat your home correctly. Consult your manufacturers or HVAC technicians about a new thermostat for replacement. 

Why Is My Furnace Blowing Cold Air – Conclusion

If your furnace is not heating up even after switching it on, a thorough assessment of your furnace is necessary.   

Many homeowners get concerned and search the internet to learn ‘Why is my furnace blowing cold air?’. Relax and take your time to troubleshoot your furnace since it might probably be a simple breakdown that you can solve on your own. 

We recommend you contact and keep in touch with your HVAC technicians for regular maintenance and repair schedules to help keep your furnace going. 

Use this article to troubleshoot your furnace whenever you notice that it’s been blowing cold air instead of warm air to your rooms. 

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