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Why Is My Furnace Blowing Cold Air?

Monday, October 08, 2018
Why Is My Furnace Blowing Cold Air?

Here at Day & Nite Plumbing and Heating, we know that it can be frustrating when your HVAC equipment isn't working correctly. You just want your home to be comfortable, but occasionally you end up with an uncooperative system that doesn't seem to do what you want it to. One particular piece of equipment we focus on during the fall and winter is the furnace. This part of your HVAC system is meant to keep you warm, but what do you do if it's blowing cold air?

This problem is more likely than you might think. There are a few different underlying issues that could cause this, and they may require the help of an HVAC professional. Here's a look at some of them.

Your Thermostat Settings

If your furnace is blowing cold air occasionally, your thermostat should be the first thing that you check. It's a common cause of this problem and an easy enough issue to fix. If you've turned the unit ON with your thermostat, the furnace could be blowing air even if it hasn't heated it up first. Set your thermostat to AUTO instead. This should solve the problem and ensure that your furnace is only blowing air that's been warmed up. This quick fix will ensure that your HVAC equipment isn't wasting energy.

The Pilot Light is Out

If your furnace is only blowing cold air, the pilot light could be the culprit. If the pilot light has gone out there's no way to warm the air coming through the furnace. You can relight it if you're comfortable doing so yourself, but a professional can help you out here as well. If the light stays on, you're all set and should start feeling warm air from your furnace soon.

If the pilot light doesn't stay on, you need to look for other potential problems. First check the gas valve switch to make sure it's in the ON position. Your pilot light won't stay lit if gas isn't flowing through. The pilot light could also be dirty. If the light is clean and the gas valve switch is in the right position, it's a more complex problem that requires a furnace repair expert.

An Overheated Furnace

If your furnace blows cold air and then stops blowing air altogether, it could be a sign that it has overheated. HVAC equipment like this has fail safes in place to cease function if it could be dangerous or damaging to your equipment. The issue could be a dirty furnace air filter. Swapping it out for a new one could solve the problem. Overheating can cause damage over the time and shorten the life of your unit, so you should never ignore this particular issue.

Duct Issues

If you've eliminated some of these other problems, your furnace could be blowing cold air due to duct problems. Fixing up ducts and repairing leaks is a critical part of HVAC maintenance. Our team can take a look and see if cold air from your attic or crawlspace is cooling the air that's circulating in your home. Contact us if you have any more questions about your furnace or other HVAC equipment!


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