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Why is My Furnace Blowing Cold Air?

Updated: Apr 7

Why is my furnace blowing cold air? There are a multitude of potential reasons why this could be happening. Take a look below to see if you find your solution.

The Filter is Dirty

It is possible that your furnace is blowing cold air because the filter is too dirty. When this happens, the hot air from the furnace gets trapped and cannot flow through your house properly. Because of this, it is important to regularly clean your air filter for your HVAC system and replace it when necessary. If you need assistance with cleaning or replacing your filter, Max C. Smith Company can help.

The Fan Isn’t Being used Correctly

Check the fan setting on your thermostat. If it is set to “On” instead of “Auto,” that may be the issue. If the thermostat is set to “Auto,” it will only blow when air is being heated. If it is set to “On,” the air will still circulate, even without the heat from the furnace. Try adjusting these settings to see if it is the root of the problem.

Thermostat Problem

Check the thermostat to make sure that all of the settings are correct. If you’ve installed a new thermostat recently, check the manual for any troubleshooting ideas, or contact Max C. Smith Company with any questions.

Out of Oil

If your furnace runs on oil, check the oil tank. If the tank is empty, it needs to be refilled in order for the furnace to work properly again.

Problem with Electronics

If you have a new furnace that has electronic controls, there could be an issue with them. The easiest way to check this is to reset the system. This requires fully turning off the system, waiting for a few minutes, and turning the system back on again. Check the manual for any troubleshooting steps or settings that you may have missed.

The Pilot Light is Off

If you have an old furnace, the pilot light could be extinguished, which cuts off the heat. Relight the pilot light to solve the problem. If the pilot light will not light, you may have a valve problem. If this is the case, Max C. Smith Company can help.

Leaking Ducts

If there are holes in your ductwork, the hot air is escaping. Unfortunately, you cannot fix this problem yourself. Thankfully, Max C. Smith Company has you covered.

If you still find yourself asking, “Why is my furnace blowing cold air?” after trying all of these solutions, it’s time to call Max C. Smith Company. Remember: do not undertake any projects with your furnace if you don’t know how. It is best to let Max C. Smith Company handle it.

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Max C. Smith Company is proud to provide our industry leading Heating & Cooling services to the North Pittsburgh region! Our team of highly trained HVAC experts can repair and service all makes and models of existing air conditioning systems. As a proud Lennox & Amana dealer, our Heating & Cooling experts can help to replace and install new and efficient heating and air conditioning systems as well. Get in touch with the Max C. Smith Company team today to get your HVAC problems fixed the right way! Contact us today!

Max C. Smith Company

Heating and Air Conditioning North Hills

3804 Gibsonia Rd,

Gibsonia, PA 15044

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