Is is it normal for my furnace to blow cold air?
by Greg Leisgang on November 14, 2014
Posted in: Furnaces
When your furnace blows cold air, it may be normal, or it could signal that you need the services of a HVAC professional to get to the root of the problem. However, you may be able to solve the problem yourself by checking these things first:
- Turn the system on and place your hand next to a register. The air will feel cold at first, as the cold air in the ductwork blows out. It takes a few seconds for that air to be pushed out by the warm air coming into the ducts.
- If the air is only cold in one room or area of your home, you may have a ductwork leak or obstruction that may require professional attention.
- The thermostat is set to "on." If you let your fan run continually, the air coming from the ducts will feel cool when the heating equipment isn't actively running. Unless you use a central air filtration system for your home, you may want to set the fan to "auto."
- Look inside the furnace and locate the pilot light if your system is older. The pilot may have gone out, which keeps gas from entering the system. One of the most important safety features on gas furnaces is the thermocouple, which automatically turns off the gas supply if the pilot light goes off. Try to relight the pilot and keep the flame going long enough for the thermocouple to warm. This part is normally close to the pilot. Keep an eye on it for a minute or so to make sure the pilot stays lit. If it won't continue to burn or does so with a yellow flame, it's time to call for immediate service.
- Check the flame sensor in the furnace. It may be dirty and require professional cleaning. If this sensor gets dirty, it'll light and then quickly extinguish itself as a safety precaution.
The pros at JonLe Heating & Cooling can help you solve these and any other problems associated with your furnace. We've proudly provided HVAC services for Cincinnati homeowners for more than 50 years.
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