Why Is My Furnace Blowing Cold Air?

You expect your furnace to keep your home warm—so when it starts blowing cold air instead, it’s more than frustrating. It’s a sign something’s not right.

If you're experiencing this, you're not alone. It’s one of the top reasons homeowners call us for furnace repair in Omaha, especially during those frigid Nebraska winters. We’ll help you identify the cause and the right solution—starting with these common culprits.

1. Thermostat Settings 

Start here. Is your fan set to “ON” instead of “AUTO”? When set to “ON,” your furnace fan runs continuously, even when the burners aren’t heating. That means you could feel cool air during off-cycles. Flip it to “AUTO” and see if the warm air returns.

2. Dirty Air Filter

A clogged filter restricts airflow, which can cause your furnace to overheat. When that happens, the system may shut off the burner as a safety precaution, leaving only the fan running. Replacing your filter is a small task that can prevent major headaches.

3. Pilot Light or Ignitor Problems

If you have an older furnace with a pilot light, check to see if it’s gone out. For newer models, the electronic ignitor could be faulty. Either way, your system won’t produce heat if the ignition source isn’t working—something our technicians can quickly troubleshoot during a furnace heating repair.

4. Ductwork Issues

Leaks or blockages in your ducts can cause uneven heating or cold air to blow from certain vents. If some rooms are fine but others feel like an icebox, it could be your ductwork—not your furnace.

5. Your System Is Nearing the End

If your unit is 15–20 years old, frequent cold-air issues might be a sign it’s time to consider furnace replacement. Constant repairs add up fast—and a new system can offer better performance, lower energy bills, and peace of mind for years to come.

You Don’t Have to Figure It Out Alone

At Controlled Comfort, we take the guesswork out of furnace problems. Our certified techs are here for honest diagnostics, efficient furnace service in Omaha, and long-term solutions that fit your home—and your budget.

Need a quick fix? We’re on it. Thinking about upgrading? We also handle full furnace installation, including help with financing and rebates. No pressure. Just clear answers and dependable support.

Contact us today to schedule your service. We’re here to keep your home warm, safe, and comfortable—no matter what Nebraska weather brings.

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