Here in Southeast Michigan, the weather can be very unpredictable. So while we may be coming out of summer it’s important to think ahead to the inevitable change of seasons. That means getting ahead of any furnace maintenance before it’s too late! The last thing you want is your furnace blowing cold air, when you need the heat. So what’s happening when your furnace is blowing cold air, and how do you correct it? Read on to find out.
Why is my furnace blowing cold air?
Here are some common causes:
Check your thermostat
It may seem obvious, but thermostat settings are often the culprit of heaters blowing cold air. Make sure your furnace is set to “heat” and not just a fan setting. Your temperature settings could be another culprit if the temperature is set too high. Also, if your thermostat is battery powered, make sure the batteries aren’t low or dead completely. If the thermostat is hard wired to power but not turning on, you may need to address the wiring by calling in a professional.
Another common culprit is your furnace filter. When the filter is clogged, it restricts air flow to the unit and that can lead to a furnace overheating. When overheating takes place in the exchange, your high limit switch will activate to turn off the burners keeping the exchange from cracking.
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