{"id":10126,"date":"2021-11-10T01:21:06","date_gmt":"2021-11-10T07:21:06","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=10126"},"modified":"2024-08-16T14:11:59","modified_gmt":"2024-08-16T19:11:59","slug":"why-is-furnace-blowing-cold-air","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/","title":{"rendered":"Why Is Your Furnace Blowing Cold Air?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/#Why_Is_the_Furnace_Blowing_Cold_Air_Common_Causes\" >Why Is the Furnace Blowing Cold Air? Common Causes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/#Thermostat_Set_To_ON\" >Thermostat Set To ON<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/#Pilot_Light_Turned_Off\" >Pilot Light Turned Off<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/#Dirty_Furnace_Air_Filter\" >Dirty Furnace Air Filter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/#Fuel_Consumed_Entirely\" >Fuel Consumed Entirely<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/#Let_Our_Experts_Figure_Out_Why_Your_Furnace_is_Blowing_Cold_Air\" >Let Our Experts Figure Out Why Your Furnace is Blowing Cold Air<\/a><\/li><\/ul><\/nav><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/why-furnace-blowing-cold-air-1-300x198.jpg\" alt=\"Why Is Your Furnace Blowing Cold Air\" width=\"300\" height=\"198\" class=\"alignright size-medium wp-image-10174\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/why-furnace-blowing-cold-air-1-300x198.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/why-furnace-blowing-cold-air-1.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>It is not uncommon for homeowners to experience the furnace blowing cold air. Often during the cold winter days, when you would like your home to be warm and cozy, you turn on the heating system, and out comes a gust of cold air. You cannot figure out what is wrong and try raising the temperature but the result still isn&rsquo;t satisfactory. The HVAC system may warm your home when set at a very high temperature, but that is not how it should work. So why is your furnace blowing cold air?<\/p>\n<p>It is important to find the root cause of why the furnace is blowing cold air and that is what we are going to discuss below. If you are still unable to find the cause yourself, hire a reliable HVAC contractor that offers <a href=\"https:\/\/www.galmicheandsons.com\/furnace-repair-services.html\">furnace repair services<\/a>. In St. Louis, and the surrounding areas, call the <a href=\"https:\/\/www.galmicheandsons.com\/contact-galmiche.php\">heating and air conditioning<\/a> experts at <span class=\"mobile_tel\"><span class=\"mobile_tel\">314-993-1110<\/span><\/span>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_Is_the_Furnace_Blowing_Cold_Air_Common_Causes\"><\/span>Why Is the Furnace Blowing Cold Air? Common Causes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>It is obvious that something is wrong with the HVAC system if the furnace is blowing cold air. But how serious is the problem? That is the question we need to answer. Below are some common reasons behind your furnace blowing cold air that you should check for if you are experiencing problems.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Thermostat_Set_To_ON\"><\/span>Thermostat Set To ON<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If the thermostat on your HVAC system is set to ON, the blower fan automatically runs. But that does not mean the furnace is on as well. The solution to this is simple. Set the thermostat&rsquo;s fan setting to AUTO instead of ON.<\/p>\n<p>When it is set to ON, the fan will keep running irrespective of whether the air is heated and ready to be delivered or not. When it is set to AUTO, on the other hand, the fan will only switch on when the air has reached the desired temperature you set.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Pilot_Light_Turned_Off\"><\/span>Pilot Light Turned Off<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If yours is an old HVAC system with a pilot light for igniting the furnace fire, this pilot light could be the cause too. Dust or a strong draft of air can sometimes cause the pilot light to get extinguished. So, your furnace is not heating the air in the heat exchanger.<\/p>\n<p>Light up the pilot flame again or get a professional <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ask-an-hvac-technician\/\">HVAC technician<\/a> to do it. This should set things back on track.<\/p>\n<p>\u00a0In the case of an <a href=\"https:\/\/www.galmicheandsons.com\/electric-furnaces.html\">electric furnace<\/a>, check the circuit breaker switch, if it is tripped, the furnace may not turn on at all. Even modern <a href=\"https:\/\/www.galmicheandsons.com\/gas-furnaces.html\">gas furnaces<\/a> have an electric starter to light the gas burner. So a tripped breaker could be the issue.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Dirty_Furnace_Air_Filter\"><\/span>Dirty Furnace Air Filter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Another reason why you may not be getting warm air from the furnace is that the air filter is too clogged and dirty. When the air filter is clogged, air cannot circulate through the HVAC system and the ductwork efficiently. Though your furnace may be heating the air all right, you could still be getting cold air.<\/p>\n<p>Make sure to get the air filter cleaned or replaced at least every other month or so.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Fuel_Consumed_Entirely\"><\/span>Fuel Consumed Entirely<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This is obvious but often forgotten. If your furnace runs on a refillable fuel source, such as a propane tank, check if your furnace still has fuel. We often tend to refill and forget. It is possible that the furnace has run out of fuel but the fan is still running, which is why you are getting cold air.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Let_Our_Experts_Figure_Out_Why_Your_Furnace_is_Blowing_Cold_Air\"><\/span>Let Our Experts Figure Out Why Your Furnace is Blowing Cold Air<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/why-furnace-blowing-cold-air-2-300x179.jpg\" alt=\"Learn Why Your Furnace is Blowing Cold Air\" width=\"300\" height=\"179\" class=\"alignleft size-medium wp-image-10175\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/why-furnace-blowing-cold-air-2-300x179.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/why-furnace-blowing-cold-air-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>If none of these tips work for you, you probably need help from expert HVAC contractors to figure out why your furnace is blowing cold air. Contact Galmiche &amp; Sons for all of your HVAC maintenance needs in St. Louis and for help with <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/what-to-do-if-furnace-blowing-cold-air\/\">furnace troubleshooting<\/a> and repair. Call our <a href=\"https:\/\/www.galmicheandsons.com\/contact-galmiche.php\">heating and air conditioning<\/a> experts to learn more.<\/p>\n<div class=\"clear\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>It is not uncommon for homeowners to experience the furnace blowing cold air. Often during the cold winter days, when you would like your home to be warm and cozy, you turn on the heating system, and out comes a gust of cold air. You cannot figure out what is wrong and try raising the temperature but the result still isn&rsquo;t satisfactory. The HVAC system may warm your home when set at a very high temperature, but that is not &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Why Is Your Furnace Blowing Cold Air?<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":10174,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[12,29,27,37,11,38],"tags":[],"class_list":["post-10126","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-furnace-maintenance","category-furnace-repair","category-furnace-tips","category-furnace-troubleshooting","category-furnaces","category-heating-cooling-faqs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why Is Your Furnace Blowing Cold Air | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"Learn tips and solutions for why your furnace is blowing cold air and find out how to troubleshoot and fix furnace problems.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why Is Your Furnace Blowing Cold Air | St. Louis HVAC Tips\" \/>\n<meta property=\"og:description\" content=\"Learn tips and solutions for why your furnace is blowing cold air and find out how to troubleshoot and fix furnace problems.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-is-furnace-blowing-cold-air\/\" \/>\n<meta property=\"og:site_name\" content=\"St. Louis HVAC Tips - Galmiche &amp; 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