Why is my furnace blowing cold air? Usually, the culprit is a thermostat set to “On” instead of “Auto,” a filthy air filter causing the system to overheat and “limit out,” or a pilot light that has gone out. In Texas, our systems often struggle with ignition failures after sitting dormant. Check your filter and thermostat first; if the air remains cold, turn the unit off to prevent a cracked heat exchanger and contact a professional heating service technician immediately.

Waking up to find your why is my furnace blowing cold air query has become a reality is a major stressor during a Texas cold snap. Whether you are in the humidity of Sugar Land and Pearland or need expert assistance in the Tyler area, a heater that won’t heat is an emergency. In 2026, understanding your furnace’s behavior can save you from a massive HVAC system repair cost.

Common Texas Furnace Questions

Should I turn off my heater if it’s blowing cold air?

Yes, absolutely. If your furnace is blowing cold air, you should turn it off at the thermostat or breaker immediately. A furnace that runs without producing heat is likely “short cycling” or has a failed ignition. Continuing to run it can burn out the blower motor or cause the heat exchanger to crack, which significantly increases your HVAC system repair cost. Always prioritize safety first!

Why is my furnace running but no heat?

This is usually caused by an Ignition Failure. Whether it’s a dirty flame sensor, a failed hot surface ignitor, or a gas valve issue, the system is trying to start but “fails safe” for your protection. Homeowners from Katy to Richmond often see this after the system has sat dormant. Regular maintenance service is the only way to prevent these carbon-buildup issues.

2026 Estimated Furnace Repair Costs

In 2026, labor and part costs have adjusted. Here is what you can expect when calling for professional help in the Houston or Tyler area:

Localized Expert Help Across Texas

We understand that a why is my furnace blowing cold air crisis feels different depending on where you live. In the Tyler area, pine needles can block exterior vents, while in the Houston metro, high humidity can rust ignition components. We proudly serve as your top-rated HVAC contractor in:

• Katy, Sugar Land, and Pearland
• Brookshire, Richmond, and Rosenberg
• Stafford and Missouri City
• Cypress, Spring, and Tyler

For more technical breakdowns or to see what your neighbors are asking, visit our community Q&A or browse our full heating service guide.

For official safety guidelines on gas furnace operation, refer to the U.S. Department of Energy (DOE) Furnace Guide.