Why Is My Furnace Blowing Cold Air?

Why Is My Furnace Blowing Cold Air?

During the winter season, it is only the furnace that can give you comfort from the chilling scenarios outside. You turn it on for the first time after several months and you end up finding out that it is malfunctioning. Or, in the worst-case scenario, you find out that it is emitting cold air! Yet, there is no need to freak out. With each of the solutions listed below, you can fix the problems yourself. 

Problem with Heating and Cooling of the Furnace:

If you are getting a thrust of cold air when you first turn on the furnace, but after a few minutes the air feels warm and comforting, then there is nothing to be worried about. It is usual for cool air to emerge from the vents in the beginning because the furnace has to warm up. Thus, you can restore your furnace’s ducted heating and cooling capability. 

Thermostat Set to on:

When there is a gradual flow of cool air coming from your furnace, you need to check your thermostat to see if the unit’s fan mode is set to “on” or “auto.” If the device’s fan mode is set to “on,” it will lead to your furnace blower constantly running even though your furnace is not heating the air. By changing the mode of the thermostat to “auto,” the fan will blow only when the furnace is heating the air.

The Flame Sensor is Dirty:

You need to clean the flame sensor frequently. Otherwise, the furnace will turn and begin heating but soon it will turn cold enough. If you have a strong knowledge of your furnace components, you can opt to clean the flame sensor. 

Pilot Light Being Out:

Suppose your gas furnace is too old and it is emitting cold air. One probable reason behind this defect might be that its pilot light has gone out. If you are confident enough, you can follow the manual and relight it safely. Once the process is over, check if it stays lit. You may need to get help from a professional in case it does not happen.

Clogged Air Filter:

Dirty air filters are a source of constant trouble because they limit airflow into your furnace. The limited flowing of air can cause your furnace to run for a prolonged time to heat your home until it overheats. It may so happen that due to overheating of the furnace, you will only get cold air. What you can do is to replace the dirty air filter with a clean one. If airflow to the device is no longer restricted, it will start to function normally. This process will reduce overheating problems.

If you indulge in regular maintenance and air conditioning service, problems such as furnaces blowing cold air will cease to exist. Alternatively, you can seek the help and guidance of a service expert. It will not only help to prevent sudden failures but also ensure the overall efficiency of your system.