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The absolute last thing you want from your furnace is for it to blow out cold air, especially during chilly months. This is doubly true when you live in a northern city like Butler, Pennsylvania. If this happens with your furnace, don’t panic. There are a few potential reasons for a malfunction, and many of them are diagnosable without having to call in a specialist. Even if you do need professional help, understanding potential problems with your furnace makes you a more capable homeowner. Let’s explore some reasons why your furnace might be blowing out cold air below.