Few things are as frustrating as turning up your thermostat on a chilly day, only to feel cold air coming from your vents. Your furnace is meant to keep your home warm and cozy, so when it starts blowing cold air, it's a clear sign that something isn't right. Explore the common causes of this issue and what you can do to resolve them.
Thermostat Settings Are Incorrect
The first thing to check is your thermostat. Is it set to "heat"? If it's on "fan," the furnace may blow air without heating it. Ensure the settings are correct and the temperature is high enough to trigger the heating cycle.
Pilot Light or Ignition Issues
For gas furnaces, a blown-out pilot light or ignition problem can prevent the furnace from producing heat. This could be due to a draft, dirt buildup, or a malfunctioning ignition system. Relighting the pilot or consulting a professional may solve the issue.
Clogged or Dirty Air Filters
A dirty air filter restricts airflow and can cause your furnace to overheat. When this happens, the safety system shuts off the burners, leaving only the fan to circulate air. Regular filter changes can prevent this problem.
Empty or Disconnected Fuel Supply
If you use propane or oil, check your fuel levels. A depleted tank means no heat. For natural gas systems, ensure the gas supply is connected and functional.
Overheating Furnace
Overheating triggers a safety feature that shuts off the heat to prevent damage. Causes include dirty components, restricted airflow, or mechanical failure. This situation often requires professional maintenance.
Ductwork Issues
Sometimes, the problem isn't the furnace but the ductwork. Leaks or poor insulation in your ducts can let cold air mix with the heated air, lowering the temperature by the time it reaches your vents.
Call a Professional
While some of these issues are simple fixes, others may require expert attention. If you're unable to identify the cause or fix the problem, call D&J Heating and Air, LLC at (864) 562-8396 or fill out our online form to schedule an appointment.
