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Why Is My Furnace Blowing Cold Air? Here Are The Top 8 Reasons

Many people wonder “why is my furnace blowing cold air," and in many cases, the answer is not as alarming as they thought. But it pays to know the basics so you can diagnose your furnace.

If your furnace is acting up, your first instinct might be to rush to call a local heating service, which is good, but it’s still important to at least understand why your furnace is blowing cold air. Half of the remedy lies in understanding the issue, and if you have a heater blowing cold air, then there may be either something seriously wrong with it or it might be configured wrong. In any case, a furnace not blowing hot air is not helping anyone, and you need to find a fix, quick! Cold air blowing out of a furnace heater is merely a symptom. In this article, we’ll explore the underlying cause – i.e., why your furnace is unable to heat the room.

Furnace Blowing Cold Air Instead Of Heat? Here Are The Possible Reasons

If you’ve been frantically googling “why is my heater blowing cold air,” you’re in the right place.

Here are some reasons why your house furnace is not working properly, and why you’re not getting any hot air:

Furnace Isn't Warmed Up Yet

Why is my furnace blowing cold air, you ask? If your central heater is blowing cold air in the house, perhaps the heating furnace is just not warm enough yet.

Thermostat Is Set Incorrectly

If you’re worried that “my furnace is blowing cold air,” you may want to take some time and ‌look at your thermostat as it directly affects how a gas/electric furnace works.

A technician is removing a dirty filter from the vent system of a furnace not blowing hot air

Furnace Filter Is Dirty

Most people who complain “why is my electric heater blowing cold air,” don’t stop and realize that the problem with their system may be poor maintenance, i.e., too much dust in the furnace filters.

Furnace Has Overheated

Many people call us over complaining “why does my heater blow cold air,” and the answer is that their furnace has overheated due to dirt buildup and other such issues. Regular maintenance and servicing can help avoid such troubles for your household furnace.

Condensate Line Is Clogged

The clogging of the condensate line is once again a consequence of poor maintenance and no regular servicing routine and is a major reason for a thermostat blowing cold air on heat mode. If you notice such issues, you should call over an expert immediately.

No Pilot Light

Did you check the pilot light? This is one of the most overlooked areas that can cause issues with your unit. If the light is not on, you must seek professional assistance immediately as it may show deeper issues within your system.

Gas Supply Problem

Maybe everything is fine with your furnace system, but it's still acting up and you're losing it. If your furnace is blowing cold air sometimes without any issues with its systemic components, then perhaps the gas supply is the issue. Non-optimal gas supply can cause performance issues.

Air Channels Are Leaking

Do you notice leaks in the air channels of your furnace (you can use soapy water to test this but be careful)? If so, then this may be the answer to your “why my central heat is blowing cold air” Google searches.

How Do You Fix a Furnace That Blows Cold Air?

A furnace blowing cold air instead of heat can’t be good news. If you’re stuck in a house heater blowing cold air, you need an immediate fix. Now that you better understand “why is my central heat blowing cold air,” you should leave the rest to trusted professionals only. Remember, only qualified and experienced technician  such as our folks at the Smart Air Cooling and Heating can ensure your problem is gone for good.

A person’s hand over the vent outlets of a room heater blowing cold air; this needs fixing

Leaving the job to unqualified professionals may exacerbate the issue instead of solving it.

Get in Touch & Schedule an Appointment

Hopefully, by now you understand how do you fix a furnace that blows cold air. If you're worried about an HVAC blowing cold air on heat mode, no need to busy your mind with any further troubles. Smart Air Cooling and Heating is always eager to assist clients in all capacities within our domain; we operate in all major Austin areas, including:

  • Westlake 
  • Rolling Wood 
  • Dripping Springs
  • Buda

Call us now for quick repairs!