You walk into your house on a cold winter day, and the first thing you notice is the cold air blowing out of your furnace. What’s going on? Why won’t your furnace heat your home?
In this post, we’ll walk you through some common causes of a furnace service that’s blowing cold air.

Here’re some of the reasons why your furnace is blowing cold air.

The Furnace Pressure Switch Is Stuck
One of the possible reasons why your furnace might be blowing cold air is that the furnace pressure switch is stuck. This switch is responsible for telling the furnace when it’s safe to start burning fuel, and if it’s stuck, the furnace might think it’s already running and won’t ignite. As a result, you’ll get cold air blowing from your vents.

The Furnace Blower Is Dirty
It’s possible that the furnace blower is dirty, which is why your furnace is blowing cold air. This means that the furnace isn’t able to distribute the heat properly throughout your home.
To determine if the furnace blower is dirty, take a look at the blower and fan. If they’re covered in dust or dirt, then they need to be cleaned. You can either clean them yourself or call a professional like Frost Heating & Cooling to do it for you.

The Furnace Gas Valve Is Closed
One possible reason your furnace might be blowing cold air is that the furnace gas valve is closed. This valve supplies natural gas to the furnace, and if it’s closed, the furnace won’t be able to generate heat.
You can do this to troubleshoot the problem. First, check to see if the valve is in the open position. If it is, then you’ll need to call a professional to investigate why the furnace isn’t generating heat.

The thermostat is too high or low.
Chances are, the thermostat is to blame. There is a probability that the thermostat is set too high or low or that it’s not working properly.
First, find out if the furnace thermostat is turned on. Many people forget to turn it on before they start to heat their homes in the winter.
Next, check the thermostat’s settings. Make sure it’s set to heating mode and that the temperature is set to a level that’s comfortable for you.
After doing all these and your furnace is still blowing cold air, it’s possible that the thermostat needs to be replaced.

Dirty Furnace Filter
One common reason for a furnace blowing cold air is a dirty furnace filter. If your filter is clogged, it will prevent the warm air from getting through, causing the furnace to blow cold air. Replacing the furnace filter every 3-6 months is essential for optimal performance. Be sure to check the filter regularly and replace it as needed so that you don’t have to deal with a cold winter!

Leaks in the Ductwork
In case your furnace is blowing cold air, the first thing you should do is check for leaks in the ductwork. Leaks can cause your furnace to work harder than necessary, which can lead to decreased efficiency and higher energy bills.

There are many reasons why your furnace might be blowing cold air instead of heating your home such as the filter is dirty and needs to be replaced or the blower motor needs to be serviced or replaced.

If you’re experiencing this problem, it’s best to call a furnace maintenance service like Frost Heating & Cooling to diagnose and fix the issue. They will be able to discover what’s wrong with your furnace and fix it so that you can start enjoying warm air again.