{"id":18775,"date":"2025-11-21T10:38:24","date_gmt":"2025-11-21T16:38:24","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=18775"},"modified":"2025-11-25T08:59:15","modified_gmt":"2025-11-25T14:59:15","slug":"how-a-gas-furnace-works","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/","title":{"rendered":"How a Gas Furnace Works: A Homeowner&#8217;s Guide to Reliable Heating"},"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\/how-a-gas-furnace-works\/#What_Is_a_Gas_Furnace_and_How_Does_It_Work\" >What Is a Gas Furnace and How Does It Work?<\/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\/how-a-gas-furnace-works\/#The_Basic_Heating_Cycle\" >The Basic Heating Cycle<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#Key_Components_of_a_Gas_Furnace\" >Key Components of a Gas Furnace<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#Main_Components\" >Main Components<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#Why_Understanding_Gas_Furnace_Operation_Matters\" >Why Understanding Gas Furnace Operation Matters<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#Benefits_of_Knowing_How_Your_Furnace_Operates\" >Benefits of Knowing How Your Furnace Operates<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#Common_Pain_Points_Homeowners_Experience\" >Common Pain Points Homeowners Experience<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#FAQs_About_How_a_Gas_Furnace_Works\" >FAQs About How a Gas Furnace Works<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#Call_Galmiche_Sons_for_Expert_Gas_Furnace_Services_in_St_Louis\" >Call Galmiche &#038; Sons for Expert Gas Furnace Services in St. Louis<\/a><\/li><\/ul><\/nav><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-1-300x200.jpg\" alt=\"How a Gas Furnace Works: A Homeowner's Guide to Reliable Heating\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-18798\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-1-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-1.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\r\n<p>Understanding how a gas furnace works gives homeowners the confidence to make informed decisions about repairs, replacements, and long term maintenance. At Galmiche &#038; Sons, we have served the St. Louis area for generations, providing expert heating solutions backed by trusted HVAC knowledge and exceptional customer service. This guide explains the fundamentals of gas furnace operation and helps you recognize key components, efficiency factors, and common issues.<\/p>\r\n<p>To learn more about <a href=\"https:\/\/www.galmicheandsons.com\/gas-furnaces.html\">gas furnaces<\/a> and our services, contact us online or by phone today.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"What_Is_a_Gas_Furnace_and_How_Does_It_Work\"><\/span>What Is a Gas Furnace and How Does It Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>A gas furnace is a central heating system that uses natural gas to generate warm air that circulates throughout your home. While the process may sound complex, it follows a clear and efficient sequence designed to deliver steady comfort.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"The_Basic_Heating_Cycle\"><\/span>The Basic Heating Cycle<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul>\r\n<li><strong>Thermostat Sends a Signal<\/strong>: When indoor temperatures drop below your thermostat setting, it tells the furnace to turn on.<\/li>\r\n<li><strong>Burners Ignite<\/strong>: The furnace&#8217;s ignition system lights the gas burners safely and efficiently.<\/li>\r\n<li><strong>Heat Exchanger Warms Up<\/strong>: Hot combustion gases flow through the heat exchanger, warming the metal walls.<\/li>\r\n<li><strong>Air Blower Activates<\/strong>: The blower pushes room temperature air across the heat exchanger.<\/li>\r\n<li><strong>Warm Air Travels Through Ducts<\/strong>: The heated air moves through your ductwork and into each room.<\/li>\r\n<li><strong>Exhaust Gases Exit Safely<\/strong>: Combustion byproducts leave your home through a vent or flue.<\/li>\r\n<\/ul>\r\n<p>This process repeats until your home reaches the desired temperature.<\/p>\r\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-2-300x200.jpg\" alt=\"How a Gas Furnace Works | St. Louis Gas Furnace Maintenance\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-18799\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-2-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Key_Components_of_a_Gas_Furnace\"><\/span>Key Components of a Gas Furnace<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>A deeper understanding of your furnace begins with learning what each part does and how it contributes to the entire system.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Main_Components\"><\/span>Main Components<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul>\r\n<li><strong>Thermostat<\/strong>: Communicates temperature needs.<\/li>\r\n<li><strong>Burners<\/strong>: Create controlled flames for heating.<\/li>\r\n<li><strong>Ignition System<\/strong>: Lights the burners using an electronic ignitor.<\/li>\r\n<li><strong>Heat Exchanger<\/strong>: Transfers heat to the air safely.<\/li>\r\n<li><strong>Blower Motor<\/strong>: Pushes warm air into the duct system.<\/li>\r\n<li><strong>Air Filter<\/strong>: Traps dust, allergens, and debris.<\/li>\r\n<li><strong>Flue or Vent Pipe<\/strong>: Removes combustion gases.<\/li>\r\n<\/ul>\r\n<p>If any of these components begin to fail, your furnace may not heat properly or may run less efficiently.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Why_Understanding_Gas_Furnace_Operation_Matters\"><\/span>Why Understanding Gas Furnace Operation Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>When homeowners understand how a gas furnace works, they are better prepared to identify early warning signs of trouble and take action before small problems turn into major repairs.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Benefits_of_Knowing_How_Your_Furnace_Operates\"><\/span>Benefits of Knowing How Your Furnace Operates<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul>\r\n<li>Better energy efficiency<\/li>\r\n<li>Improved indoor comfort<\/li>\r\n<li>Lower risk of breakdowns<\/li>\r\n<li>More informed decisions when choosing repair or replacement options<\/li>\r\n<\/ul>\r\n<h2><span class=\"ez-toc-section\" id=\"Common_Pain_Points_Homeowners_Experience\"><\/span>Common Pain Points Homeowners Experience<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Many St. Louis homeowners run into similar frustrations with their furnace, especially when temperatures drop.<\/p>\r\n<p>Frequent Issues Include:<\/p>\r\n<ul>\r\n<li>Uneven heating or cold spots<\/li>\r\n<li>Rising energy bills<\/li>\r\n<li>Strange noises from the furnace<\/li>\r\n<li>Short cycling or constant running<\/li>\r\n<li>Poor indoor air quality<\/li>\r\n<\/ul>\r\n<p>If you notice unusual sounds, inconsistent heat, or higher utility bills, your furnace may need attention. Understanding how a gas furnace works helps you recognize early signs, but diagnosing and fixing issues safely requires professional HVAC expertise. Galmiche &#038; Sons addresses these issues by providing detailed inspections, high quality parts, and expert recommendations tailored to your home.<\/p>\r\n<p>Learn more about <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/gas-furnace-problems\/\">common gas furnace problems and solutions<\/a>.<\/p>\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"FAQs_About_How_a_Gas_Furnace_Works\"><\/span>FAQs About How a Gas Furnace Works<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1763717718439\"><strong class=\"schema-faq-question\">Why does my furnace keep turning on and off?<\/strong> <p class=\"schema-faq-answer\">This could be due to a dirty filter, improper sizing, thermostat issues, or a failing flame sensor.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1763717730032\"><strong class=\"schema-faq-question\">How often should I replace my furnace filter?<\/strong> <p class=\"schema-faq-answer\">Most homes benefit from replacing filters every 1 to 3 months depending on indoor air quality and usage.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1763717746928\"><strong class=\"schema-faq-question\">Does a gas furnace need regular maintenance?<\/strong> <p class=\"schema-faq-answer\">Yes. Annual tune ups help improve efficiency, prevent breakdowns, and extend equipment life.<\/p> <\/div> <\/div>\r\n\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"Call_Galmiche_Sons_for_Expert_Gas_Furnace_Services_in_St_Louis\"><\/span>Call Galmiche &#038; Sons for Expert Gas Furnace Services in St. Louis<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>For dependable service, clear answers, and trusted guidance, contact Galmiche &#038; Sons. Whether you need help with repairs, installation, or understanding your system better, our team is here to keep your home warm and comfortable.<\/p>\r\n<p>Reach out today to schedule furnace repair services in St. Louis or to learn more about how we can help your heating system run at its best.<\/p>","protected":false},"excerpt":{"rendered":"<p>Understanding how a gas furnace works gives homeowners the confidence to make informed decisions about repairs, replacements, and long term maintenance. At Galmiche &#038; Sons, we have served the St. Louis area for generations, providing expert heating solutions backed by trusted HVAC knowledge and exceptional customer service. This guide explains the fundamentals of gas furnace operation and helps you recognize key components, efficiency factors, and common issues. To learn more about gas furnaces and our services, contact us online or &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">How a Gas Furnace Works: A Homeowner&#8217;s Guide to Reliable Heating<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":18798,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[27,11,38],"tags":[],"class_list":["post-18775","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-furnace-tips","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>How a Gas Furnace Works | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"Discover how a gas furnace works with our comprehensive guide. Gain insights into repairs, maintenance, and efficiency for reliable home heating.\" \/>\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\/how-a-gas-furnace-works\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How a Gas Furnace Works | St. Louis HVAC Tips\" \/>\n<meta property=\"og:description\" content=\"Discover how a gas furnace works with our comprehensive guide. Gain insights into repairs, maintenance, and efficiency for reliable home heating.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/\" \/>\n<meta property=\"og:site_name\" content=\"St. Louis HVAC Tips - Galmiche &amp; Sons\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/GalmicheAndSons\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-21T16:38:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-25T14:59:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"600\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Steve Dulle\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@GalmicheAndSon\" \/>\n<meta name=\"twitter:site\" content=\"@GalmicheAndSon\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Steve Dulle\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/\"},\"author\":{\"name\":\"Steve Dulle\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#\\\/schema\\\/person\\\/b90d5d47a6f393d93d6459a9aa8b2fe1\"},\"headline\":\"How a Gas Furnace Works: A Homeowner&#8217;s Guide to Reliable Heating\",\"datePublished\":\"2025-11-21T16:38:24+00:00\",\"dateModified\":\"2025-11-25T14:59:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/\"},\"wordCount\":667,\"publisher\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/how-a-gas-furnace-works-1.jpg\",\"articleSection\":[\"Furnace Tips\",\"Furnaces\",\"Heating &amp; Cooling FAQs\"],\"inLanguage\":\"en-US\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/\",\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/\",\"name\":\"How a Gas Furnace Works | St. Louis HVAC Tips\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/how-a-gas-furnace-works-1.jpg\",\"datePublished\":\"2025-11-21T16:38:24+00:00\",\"dateModified\":\"2025-11-25T14:59:15+00:00\",\"description\":\"Discover how a gas furnace works with our comprehensive guide. Gain insights into repairs, maintenance, and efficiency for reliable home heating.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#breadcrumb\"},\"mainEntity\":[{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#faq-question-1763717718439\"},{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#faq-question-1763717730032\"},{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#faq-question-1763717746928\"}],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/how-a-gas-furnace-works-1.jpg\",\"contentUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/how-a-gas-furnace-works-1.jpg\",\"width\":600,\"height\":400,\"caption\":\"How a Gas Furnace Works: A Homeowner's Guide to Reliable Heating\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"HVAC Tips\",\"item\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Furnaces\",\"item\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/category\\\/furnaces\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"How a Gas Furnace Works: A Homeowner&#8217;s Guide to Reliable Heating\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#website\",\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/\",\"name\":\"St. Louis HVAC Tips - Galmiche & Sons\",\"description\":\"For Heating and Cooling services in St. Louis, contact Galmiche &amp; Sons, your St. Louis commercial and residential HVAC installation, maintenance, and repair experts.\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#organization\",\"name\":\"Galmiche & Sons Heating & Cooling\",\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/organization-logo.png\",\"contentUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/organization-logo.png\",\"width\":\"696\",\"height\":\"696\",\"caption\":\"Galmiche & Sons Heating & Cooling\"},\"image\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/GalmicheAndSons\\\/\",\"https:\\\/\\\/x.com\\\/GalmicheAndSon\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#\\\/schema\\\/person\\\/b90d5d47a6f393d93d6459a9aa8b2fe1\",\"name\":\"Steve Dulle\",\"sameAs\":[\"https:\\\/\\\/www.silverscopedesign.com\\\/\",\"https:\\\/\\\/www.linkedin.com\\\/in\\\/stevedulle\\\/\"]},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#faq-question-1763717718439\",\"position\":1,\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#faq-question-1763717718439\",\"name\":\"Why does my furnace keep turning on and off?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This could be due to a dirty filter, improper sizing, thermostat issues, or a failing flame sensor.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#faq-question-1763717730032\",\"position\":2,\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#faq-question-1763717730032\",\"name\":\"How often should I replace my furnace filter?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most homes benefit from replacing filters every 1 to 3 months depending on indoor air quality and usage.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#faq-question-1763717746928\",\"position\":3,\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/how-a-gas-furnace-works\\\/#faq-question-1763717746928\",\"name\":\"Does a gas furnace need regular maintenance?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Annual tune ups help improve efficiency, prevent breakdowns, and extend equipment life.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How a Gas Furnace Works | St. Louis HVAC Tips","description":"Discover how a gas furnace works with our comprehensive guide. Gain insights into repairs, maintenance, and efficiency for reliable home heating.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/","og_locale":"en_US","og_type":"article","og_title":"How a Gas Furnace Works | St. Louis HVAC Tips","og_description":"Discover how a gas furnace works with our comprehensive guide. Gain insights into repairs, maintenance, and efficiency for reliable home heating.","og_url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/","og_site_name":"St. Louis HVAC Tips - Galmiche &amp; Sons","article_publisher":"https:\/\/www.facebook.com\/GalmicheAndSons\/","article_published_time":"2025-11-21T16:38:24+00:00","article_modified_time":"2025-11-25T14:59:15+00:00","og_image":[{"width":600,"height":400,"url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-1.jpg","type":"image\/jpeg"}],"author":"Steve Dulle","twitter_card":"summary_large_image","twitter_creator":"@GalmicheAndSon","twitter_site":"@GalmicheAndSon","twitter_misc":{"Written by":"Steve Dulle","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#article","isPartOf":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/"},"author":{"name":"Steve Dulle","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/#\/schema\/person\/b90d5d47a6f393d93d6459a9aa8b2fe1"},"headline":"How a Gas Furnace Works: A Homeowner&#8217;s Guide to Reliable Heating","datePublished":"2025-11-21T16:38:24+00:00","dateModified":"2025-11-25T14:59:15+00:00","mainEntityOfPage":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/"},"wordCount":667,"publisher":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/#organization"},"image":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#primaryimage"},"thumbnailUrl":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-1.jpg","articleSection":["Furnace Tips","Furnaces","Heating &amp; Cooling FAQs"],"inLanguage":"en-US"},{"@type":["WebPage","FAQPage"],"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/","url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/","name":"How a Gas Furnace Works | St. Louis HVAC Tips","isPartOf":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#primaryimage"},"image":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#primaryimage"},"thumbnailUrl":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-1.jpg","datePublished":"2025-11-21T16:38:24+00:00","dateModified":"2025-11-25T14:59:15+00:00","description":"Discover how a gas furnace works with our comprehensive guide. Gain insights into repairs, maintenance, and efficiency for reliable home heating.","breadcrumb":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#breadcrumb"},"mainEntity":[{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#faq-question-1763717718439"},{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#faq-question-1763717730032"},{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#faq-question-1763717746928"}],"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#primaryimage","url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-1.jpg","contentUrl":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/2025\/11\/how-a-gas-furnace-works-1.jpg","width":600,"height":400,"caption":"How a Gas Furnace Works: A Homeowner's Guide to Reliable Heating"},{"@type":"BreadcrumbList","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"HVAC Tips","item":"https:\/\/www.galmicheandsons.com\/hvac-blog\/"},{"@type":"ListItem","position":2,"name":"Furnaces","item":"https:\/\/www.galmicheandsons.com\/hvac-blog\/category\/furnaces\/"},{"@type":"ListItem","position":3,"name":"How a Gas Furnace Works: A Homeowner&#8217;s Guide to Reliable Heating"}]},{"@type":"WebSite","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/#website","url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/","name":"St. Louis HVAC Tips - Galmiche & Sons","description":"For Heating and Cooling services in St. Louis, contact Galmiche &amp; Sons, your St. Louis commercial and residential HVAC installation, maintenance, and repair experts.","publisher":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/#organization","name":"Galmiche & Sons Heating & Cooling","url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/organization-logo.png","contentUrl":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/organization-logo.png","width":"696","height":"696","caption":"Galmiche & Sons Heating & Cooling"},"image":{"@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/GalmicheAndSons\/","https:\/\/x.com\/GalmicheAndSon"]},{"@type":"Person","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/#\/schema\/person\/b90d5d47a6f393d93d6459a9aa8b2fe1","name":"Steve Dulle","sameAs":["https:\/\/www.silverscopedesign.com\/","https:\/\/www.linkedin.com\/in\/stevedulle\/"]},{"@type":"Question","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#faq-question-1763717718439","position":1,"url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#faq-question-1763717718439","name":"Why does my furnace keep turning on and off?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"This could be due to a dirty filter, improper sizing, thermostat issues, or a failing flame sensor.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#faq-question-1763717730032","position":2,"url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#faq-question-1763717730032","name":"How often should I replace my furnace filter?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Most homes benefit from replacing filters every 1 to 3 months depending on indoor air quality and usage.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#faq-question-1763717746928","position":3,"url":"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-a-gas-furnace-works\/#faq-question-1763717746928","name":"Does a gas furnace need regular maintenance?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. Annual tune ups help improve efficiency, prevent breakdowns, and extend equipment life.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/posts\/18775","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/comments?post=18775"}],"version-history":[{"count":0,"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/posts\/18775\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/media\/18798"}],"wp:attachment":[{"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/media?parent=18775"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/categories?post=18775"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-json\/wp\/v2\/tags?post=18775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}