While your first instinct might be to call your HVAC system technician, your furnace might be operating normally. You hear your furnace kick on but there is no airflow, or you find the heater blowing cold air. If you have made some of the described adjustments and your system does not respond, it may be time to contact your local Carrier HVAC technician for a professional analysis of your heating system. Of course, if your thermostat is not working or the furnace has a mechanical issue, these adjustments likely won’t resolve the issue of your furnace blowing cold air. If you have a programmable thermostat, review your “comfort schedule” for any issues, and make sure your programmed settings haven’t shifted times due to daylight savings time.Check the temperature setting to make sure somebody else didn’t change it to a lower setting.Changing the fan setting to “auto” will turn off the blower when the system is not actively heating and turn it on when it's time to heat your home. ![]() Is the fan set to run continuously? If so, your system may be circulating cool air between heating cycles.When it’s set to auto, it will automatically change between heating and cooling as temperatures change. Is it set for air conditioning instead of heating? If it is, simply re-set the thermostat to heat your home.If you experience any of these symptoms, the first step is to check the thermostat and look for the obvious answers. With all of these choices, there are a number of scenarios involving your thermostat that can result in your furnace blowing cold air. There are a lot of options when it comes to thermostats – programmable models, smart thermostats and more - but they all control both heating and cooling. If a thermostat is set incorrectly, you might notice your furnace blowing cold air from the heat registers, a lower-than-expected temperature reading on the thermostat, or you may even hear your air conditioner running outside. In the sections that follow we will explore thermostat settings and other common causes for "Why my furnace is blowing cold air”, and will offer both DIY and “call for help” solutions.ġ0 SOLUTIONS TO FIX A FURNACE NOT BLOWING HOT AIR INCORRECT THERMOSTAT SETTINGS If you end up needing help, you can connect with a local Carrier HVAC expert to schedule a furnace repair. Of course, more complicated issues often require furnace service. Simply re-setting the thermostat to auto should resolve your issue, if the system is working properly. In this case, the fan will run constantly, even when the furnace isn’t heating. If you have a furnace not blowing hot air, there could be many things causing the problem, but one of the more common reasons your furnace may be blowing cold air is set to “on” instead of set to “auto”. Why is My Carrier Furnace Blowing Cold Air? Some of these you might be able to fix yourself (if you like that sort of thing) to get the warm air flowing. Before you hit the panic button because your trusty old heater has picked a terrible time to go into hibernation, there are some legitimate reasons why normally functioning furnaces can give you the cold shoulder. There’s also nothing like the disappointment of your furnace blowing cold air inside when it’s turning cold outside. In the dead of winter, there’s nothing quite like the instant relief of holding a cold hand over a vent blowing hot air.
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