Why Does My Furnace Blow Cold Air?

One of the most frustrating experiences during the cold winter months is when your furnace blows cold air instead of providing the warm comfort you expect. The answer might be poor airflow if you’re wondering what’s causing your furnace to blow cold air.

Your heating system relies on proper ventilation through ducts and vents to work efficiently. If something blocks these areas, it can restrict the airflow. This disruption causes your furnace to blow cold air instead of warm, lowering the temperature throughout your home.

Here are some common reasons why airflow is restricted. By understanding the cause, you can troubleshoot the problem and prevent it from happening again.

Dirty Air Filter

The filter in your heating system is designed to remove harmful airborne particles and prevent illness. Over time, the filter becomes dirty or clogged, impeding airflow. Poor air circulation leads to insufficient heating and causes your furnace to blow cold air. Regularly clean or replace your furnace filters to ensure proper airflow and prevent this issue.

Blocked Vents

Warm air is distributed into your home through supply vents. If these vents are blocked by furniture or other objects, the warm air cannot circulate effectively, which makes your furnace blow cold air.

Similarly, if the return vents that pull air into the air ducts are blocked, your furnace won’t have enough air to heat and distribute. Because of the insufficient air, your furnace blows cold air instead of warm.

Clogged Coil

Some systems are designed with both a furnace and a central AC. These systems are built with an evaporator coil that absorbs heat from the surrounding air. The evaporator coil is used for the cooling cycle but also affects the heating process because it’s inside the furnace.

If the coil gets dirty or clogged, it can block airflow, causing the furnace to blow cold air. Regular maintenance and cleaning of the coil are crucial to ensure proper functioning and prevent this issue.

Repair Your Furnace

A malfunctioning furnace in the middle of winter can be disastrous. Don’t wait for the problem to worsen or until your furnace doesn’t turn on. Contact Severson Plumbing for tailored HVAC solutions. We thoroughly inspect what’s causing your furnace to blow cold air and determine the best way to fix it. You can rely on us to repair your furnace so you can stay warm and cozy at home.