Fix heating problems
What Should I Check If My Heater Is Blowing Cold Air?
If your heater is blowing cold air, the issue could be with the thermostat, air filter, or ignition system. Checking a few key areas can help determine if a simple fix is needed.
Why Your Heater Might Be Blowing Cold Air
A heating system should provide consistent warm air. If it’s not, there may be an issue that requires troubleshooting.

Common Causes of Cold Air from a Heater
- Thermostat settings: Ensure it’s set to “heat” and not “fan.”
- Dirty air filter: A clogged filter can cause overheating and shut off the burner.
- Ignition problems: If the pilot light or ignition system fails, the heater won’t produce warm air.
- Duct leaks: Warm air might be escaping before reaching your vents.
How to Fix a Heater Blowing Cold Air
Check and replace your air filter, ensure the gas supply is on, and reset your furnace. If the problem continues, an HVAC technician should inspect the system.