When your furnace is blowing cold air, chances are there’s a problem with the heat exchanger. If you’re unfamiliar with how an HVAC system works, check out this blog article to learn more about what can cause cold drafts and why it’s essential to think about changing your filter.

What is a Cold Air Return?

A cold air return is a system on your furnace that helps circulate the air in your home. The colder the outside air, the colder the air inside your home. By circulating the cold air, you can keep your home at a comfortable temperature.

The different States of Temperatures

Your furnace may be blowing cold air if it’s in a colder state than the room it’s in. This could be due to several reasons, including dirty filters, a defective blower motor, or a frozen duct. If the furnace is in your home, cleaning the filters and checking the blower motor may be all that’s necessary to get your furnace back up and running at its optimal temperature. If the furnace is in an older building or is located outdoors, it may require extensive repairs before it can be returned online.

What Causes the Furnace to Blow Cold Air?

One common cause of a furnace blowing cold air is a blocked filter. Blocked filters can be caused by debris, lint, or fur. If the blockage is severe, the furnace may be unable to circulate air properly, and heat will not be delivered to your home. All filters must be in good working order for the furnace to work correctly. If you notice any of these signs that your furnace is blowing cold air, it is essential to take action and have your filter checked out: 

  • High energy bills¬†
  • Uncomfortable indoor temperature¬†
  • Furnace blowing cold air despite being set at the correct temperature
  • How to Fix the Problem

If you notice your furnace is blowing cold air, there may be a simple fix. In most cases, the problem is with the fan or motor. Here are some tips to help you figure out and fix the issue:

1. Check to see if the fan or motor is working. If it’s not, it may be broken and must be replaced. If it is working, check to see if it’s spinning freely and if the belt is installed correctly.

2. Check if the filters are clean and in good condition. Dirty filters can cause heat exchange problems that lead to blown cold air.

3. Ensure the insulation around the ductwork and registers is in good condition. If it’s not, extra heat will escape from the system and cause your furnace to blow cold air.

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