Blowing Cold? Understanding Common Furnace Airflow Issues

Your furnace, of course, is supposed to heat your home. So if it starts blowing out cold air, something is clearly wrong. The good news is that in many cases, the problems that cause furnaces to blow cold air are not that hard to fix. Some of them are easy to fix yourself, and others can be fixed within hours by a heating repair service. Keep reading for a closer look at some common reasons why furnaces blow cold air.

Wrong Thermostat Setting

If you notice cold air coming from the vents, check your thermostat setting. Make sure your thermostat did not accidentally get switched out of “heat” mode. Also check the fan setting. If your fan is set to “on,” it will continue to blow air even when the furnace is not heating, which means that sometimes, the air coming out will be feel cold.

Turn your furnace to “heat” and the fan setting to “auto.” See if the problem persists.

No Gas Supply

If your furnace is not receiving natural or LP gas, the burner won’t turn on. However, in some systems, the fan might still run, which means cool air will come out of your vents. A lack of gas could be due to a an empty propane tank or pressure regulator issue. These are both fairly easy problems for an HVAC contractor to address. In some cases, they may need to have someone from the gas company come assist them.

Blocked Air Filters

When was the last time you changed your air filter? Professionals will typically change your filter during an annual HVAC tune-up, but you’ll also need to change your own filter every two or three months throughout the year. If the filter becomes too clogged with debris, your furnace may have to work too hard to push air through it. This can cause the furnace to overheat, trigger a safety mechanism, and turn off the furnace.

Try changing your air filter, and see if that allows your furnace to start heating again. If it does, then make a note to remember to change your filter more often, going forward.

Dirty Burner

A dirty furnace burner can also cause a furnace to stop actively heating. Burners can get dirty if you neglect to have your system cleaned and checked annually or if your home is under construction and construction dust is allowed to accumulate in the furnace.

As a homeowner, you should not attempt to clean a furnace burner yourself. Instead, contact a local company for a heating system checkup. They can not only clean the burner, but also check for other issues that may be causing your burner not to heat as intended.

Having your furnace blow cold air can be frustrating, but rest assured that most furnace problems associated with this issue are easy to repair. Contact H & H Heating & Air Conditioning if you’re looking for a reliable HVAC company in Pennsylvania. We offer gas furnace installation, repairs, and more.

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