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If your furnace is blowing cold air instead of keeping your home warm, it may indicate several possible issues. Common causes include problems with the flame detector, gas supply, air filter, pilot light, or condensate lines. While some of these problems can be resolved with basic maintenance, others may require professional heating repair. Here, we'll dive into the different reasons why your furnace may be blowing cold air and the steps you can take to fix it. Common Reasons Your Furnace May Be Blowing Cold Air and How to Fix The