Why Is My Furnace Blowing Cold Air?

furnace blowing cold airIt’s a cold winter morning, and you turn on your furnace to find nothing but cold air coming out. That’s no way to start the day. Instead of panicking, here’s a quick guide to help you figure out why your furnace is blowing cold air.

A Clogged Air Filter

When your air filter is dirty and clogged, it can lead to overheating of the heat exchanger. When this happens, the high limit switch can trip and turn off the burners that heat the air that comes from your furnace. A clean air filter is essential for proper furnace function.

The Thermostat is Set to Fan

If your thermostat setting is on “fan,” that means the fan will run whether the furnace is blowing heat or not. The fan on constantly will cause cold air to come through the vents when the furnace isn’t on. Set it to “auto,” and it should fix the problem.

The Pilot Light Has Gone Out

The pilot light ignites the flame that turns on the furnace burners to heat the air that warms your home. If the pilot light goes out, the burners can’t turn on, and the furnace can’t heat the air. Relighting the pilot light should fix the problem.

Some troubleshooting is easy to DIY, but other things require the attention of an experienced professional. If your furnace is blowing cold air, or you’re experiencing any  HVAC issues, your go-to team for repairs is at Hill Plumbing and Air. Contact them today to schedule a service to get your furnace back in business.

vintage stack

For more than 95 years, Hill Plumbing and Air has built a rock solid reputation by providing the highest quality plumbing services in Sumter, Florence and surrounding areas. We're now pleased to offer Heating and Air services to better serve our customers.

"DREW did a great job on my HVAC SVC!!!!! Many thanks to you DREW !!!! For helping me breathe on the hottest day of 2021!!!!!!! And thanks to MIKE for the great job repair the flooding under my house!!!! Thanks HILL plumbing for the best service my home and I ever had."

Willene D.

"Could not be more pleased with Juan in Sumter area. He is knowledgable and professional and actually fixed our problem for less than the original estimate. Highly recommend Hill Plumbing and Juan."

Michele O.