Furnace Making House Colder

Why Does My Furnace Make My House Colder?

December 17, 2024

It’s inconvenient when it’s freezing outside and your furnace starts blowing cold air. This is an issue you need to address as soon as possible. Here are some things that can cause a furnace to make your house in Charleston, SC, colder:

Thermostat Setting

One of the most obvious reasons a furnace might blow cold air is because of an incorrect thermostat setting. A thermostat set to “Fan” will cause your system to blow cool air if the furnace isn’t working to produce heat. If you switch the thermostat to “Auto,” the system will run only when it’s producing heat.

Another possibility is that the thermostat is faulty. When a thermostat malfunctions, it might not signal the furnace to heat properly. If your thermostat has batteries, you may need to replace them.

Pilot Light Issues

For a gas furnace, the pilot light ignites the burners. If the pilot light goes out, the burners won’t produce heat. If you see that the pilot light is out, you may need an HVAC service technician to light it.

Ignition System No Longer Works

Many modern furnaces use an electronic ignition system instead of a traditional pilot light. If something goes wrong with the ignition system, the burners won’t ignite. An ignition system problem will need a repair from a professional HVAC service technician.

Leaks in the Ductwork

The furnace might produce warm air, but it feels cold by the time it exits the vents. This can happen if heat loss occurs because of ductwork that has leaks or damage. An HVAC service technician can inspect the ducts for cracks or gaps and seal them to ensure warm air reaches your living space.

When your furnace is blowing cold air, don’t ignore the problem. Call Berkeley Heating & Air Conditioning to schedule our heating repair services.

Image provided by iStock

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