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HVAC Education, Buying Tips, Furnaces, Heat Pumps, Technology

Why Is My Furnace Blowing Cold Air?

It’s common for a furnace to blow cold air when you turn it on for the first time each season, but it can also happen at any time if something goes wrong. Luckily, it’s usually very easy to fix, and problems can also be prevented with regularly scheduled maintenance and cleaning.

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Why Is My Furnace Blowing Cold Air?

  • The furnace hasn’t warmed up yet
  • The thermostat is not set correctly
  • The electronic controls need a reboot
  • The pilot light is out (usually only with older gas furnaces)
  • The fan limit switch has malfunctioned
  • The flame sensor is dirty or malfunctioning
  • The propane or oil tank is empty (if applicable)
  • Too many supply vents are closed
  • The air filter is clogged
  • The ducts are leaking
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