Why Is My Furnace Blowing Cold Air? Common Fixes

In the winter everyone wants their home warm and cozy and they made a beneficial investment in buying a good furnace. In winters when your furnace starts giving cold air instead of hot then there is only one question: why is my furnace blowing cold  air? this thing disturbs and irritates you and then it may become a serious problem. So it is important to look for a solution like repair or replacement in case of both when a gas furnace blows cold air or an electric furnace blows cold air. 

Reasons and Solutions Behind Furnace Blowing Cold Air   

Experiencing your furnace blowing  cold air is a very frustrating thing but it is not a very serious issue it may occur due to the minor disturbance in machinery.Following are the most common reasons: 

Thermostat Settings  

Reason 

 There are a lot of options of thermostat settings  in furnaces  for giving both cold and warm air. Most of the time the thermostat is set to ON option instead of AUTO. That’s why the air becomes cold. 

solution 

 Try to adjust your thermostat to auto which automatically changes according to temperature and your furnace gives air accordingly. This is the simple adjustment for stopping the cold air but if there is some other defect in the thermostat then only a technician can repair it. 

Pilot light is out 

Reason 

When the gas furnace is blowing cold air even in cold it means that there is some slight issue in the pilot because some times when your furnace is not on the pilot light may also be out.the main purpose of pilot light is to burn and then the furnace will be able to provide warm air instead of cold air. 

Solution 

 Check your pilot light if it is out then follow the manufacturer directions to relight it. This is a very slight issue and can be repaired easily without any huge expense. So through a steady flame the furnace starts to give warm air. 

If you want professional furnace repair services in Denver contact no other than Milehi Hvac.

Dirty air filter 

Reason  

Clogged air filters strict the air flow. And sometimes your furnace works for a short time period because of dirty filters.This is due to lack of filter maintenance that results in dirt and restricts the working of the furnace. 

Solution 

Make sure that your thermostat setting is set for heating and all the settings are correct. This issue can only be resolved by consulting your professional and replacing a new air filter of better performance. 

Fuel Supply problems 

Reason 

Furnaces blowing only cold air means that  there is a problem in supply. Like low gas supply or electrical interruptions can affect the system of giving cold or warm air. 

Solution 

For this issue firstly check your gas valves or pipes if there is some leakage then fix it otherwise consult your professional. 

Air ducks leaking warm air 

Reason 

Sometimes furnaces give warm air but due to leakage is air ducks it does not reach the vents. So the furnace is functioning properly but the warm air is being lost due to this there is also an increase in your utility bills. 

Solution 

You can simply repair it on your own by turning the system on and then putting your hand over the connections you will notice it and with the help of screws you can easily straighten the sheet metal and then there is no scene of the furnace only blowing cold air. 

Malfunctioned flame sensor 

Reason 

The flame sensor in your furnaces detects flames in your burner and mostly turns off the burner if it does not detect the flame. This thing prevents the gas flow however due to a malfunctioned flame sensor gas furnace blows cold air because it turns off the furnace even if it is functioning properly.  

Solution 

The solution is that when you check the flame sensor if there are any clues like cracks then this is the reason but sometimes it is difficult to detect it. Calling a professional is the best solution. 

You may read How Much Does a New Furnace Cost?

Issues According To Furnace Types 

There are different types of furnaces so furnaces blowing cold air have different causes like 

Gas furnaces 

If gas furnace is blowing cold air it is due to  

• Problem in gas supply and pipes 

Electric furnaces 

If electric furnace is blowing cold air it is due to 

• Problem in heating parts 

• Electrical wiring issues 

• Fuses and tripped  breakers 

 When it becomes risky 

Any leakage or malfunctioning of furnace is not a serious problem it is just an inconvenience but if you don’t take any action for a long time and take it lightly it will become risky  

Here are the risks 

• Leakage for a long time can increase your bills due to wastage of gas or electricity. 

• If issues are not fixed on time it will lead to complete furnace failure. 

• Safety risks become more concerning in case of gas furnaces 

When to call the professionals 

As this problem is not very serious and can be resolved at home easily. If you have tried all the solutions and the problem is not fixed it means this has to be checked by some professional. HVAC technicians can fix deeper issues like gas pipes, heating elements or electrical wires. 

If you want a trusted and skilled professional, you must consider the MileHi HVAC. Our technicians have certified skills. We can diagnose the issue and fix the problems at that time easily whether your gas furnace is blowing cold air or electrical furnace is blowing cold air we have reliable solutions for it. So for fast services you must visit or check our website MileHi HVAC. 

Conclusion  

So my furnace is blowing cold air? It may occur due to minor problems like thermostat settings to big system failures. Mostly this problem can be resolved with quick troubleshooting but if your furnace is consistently blowing cold air then you have to check any expert. Try to visit early to save your system from further damage or risk. MileHi HVAC surely provides you better services and fixes all the issues to maintain your comfort.  

FAQs 

Could a dirty air filter cause my furnace to blow cold air?
Yes. A clogged filter restricts airflow, which can cause overheating and lead the system to shut off the burners, leaving only cold air blowing. 

Why is my furnace fan running but not producing heat?
This could be due to the pilot light being out, an issue with the ignition system, or problems with the gas supply preventing the burners from turning on. 

Can thermostat problems make a furnace blow cold air?
Absolutely. If the thermostat is set incorrectly, has dead batteries, or isn’t communicating properly with the furnace, it may run the fan without activating the heat. 

What if my furnace only blows cold air at night?
This could be linked to thermostat schedules, fluctuating gas pressure, or temperature drops that trigger furnace safety features. A technician can check these issues. 

Could low gas supply be the reason my furnace is blowing cold air?
Yes. If your home has low gas pressure or the gas valve is faulty, the furnace won’t generate enough heat, resulting in cold air circulation.