{"id":17750,"date":"2025-06-23T02:03:33","date_gmt":"2025-06-23T07:03:33","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=17750"},"modified":"2025-10-08T03:48:17","modified_gmt":"2025-10-08T08:48:17","slug":"ac-sizing-for-open-concept-homes","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-open-concept-homes\/","title":{"rendered":"AC Sizing for Open Concept Homes in St. Louis: Get Comfort Right in Large Living Spaces"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 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\/ac-sizing-for-open-concept-homes\/#Why_AC_Sizing_Matters_in_an_Open_Concept_Home\" >Why AC Sizing Matters in an Open Concept Home<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-open-concept-homes\/#Factors_That_Impact_AC_Sizing_in_Open_Layouts\" >Factors That Impact AC Sizing in Open Layouts<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-open-concept-homes\/#1_Square_Footage_and_Volume\" >1. Square Footage and Volume<\/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\/ac-sizing-for-open-concept-homes\/#2_Sun_Exposure_and_Windows\" >2. Sun Exposure and Windows<\/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\/ac-sizing-for-open-concept-homes\/#3_Airflow_and_Zoning\" >3. Airflow and Zoning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-open-concept-homes\/#4_Appliances_and_Occupants\" >4. Appliances and Occupants<\/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\/ac-sizing-for-open-concept-homes\/#Expert_AC_Sizing_for_Open_Concept_Homes_in_St_Louis\" >Expert AC Sizing for Open Concept Homes in St. Louis<\/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\/ac-sizing-for-open-concept-homes\/#FAQs_AC_Sizing_for_Open_Concept_Homes\" >FAQs: AC Sizing for Open Concept Homes<\/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\/ac-sizing-for-open-concept-homes\/#Take_Control_of_Comfort_in_Your_Open_Concept_Home\" >Take Control of Comfort in Your Open Concept Home<\/a><\/li><\/ul><\/nav><\/div>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-open-concept-homes-1-300x200.jpg\" alt=\"AC Sizing for Open Concept Homes in St. Louis\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17798\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-open-concept-homes-1-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-open-concept-homes-1-1024x683.jpg 1024w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-open-concept-homes-1.jpg 1200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p>Open concept homes have become incredibly popular for their spaciousness, natural light, and seamless flow between living, dining, and kitchen areas. However, with fewer walls and higher ceilings, these modern layouts pose unique challenges for heating and cooling, particularly when it comes to AC sizing for open concept homes.<\/p>\r\n<p>At Galmiche &#038; Sons, we help homeowners across the St. Louis area get AC sizing right from the start. Whether you are designing a new home or upgrading an older system to better serve an open floor plan, the right size air conditioner can make all the difference in comfort, efficiency, and energy savings. Contact us to learn more about <a href=\"https:\/\/www.galmicheandsons.com\/air-conditioner-sizing.html\">air conditioner sizing<\/a> and <a href=\"https:\/\/www.galmicheandsons.com\/quote-request.php\">request a quote for your new HVAC system<\/a>.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Why_AC_Sizing_Matters_in_an_Open_Concept_Home\"><\/span>Why AC Sizing Matters in an Open Concept Home<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>An <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-undersized-air-conditioner-units-fail-your-home\/\">air conditioner that&#8217;s too small<\/a> will run constantly without fully cooling the space. An <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/oversized-ac-unit-problems\/\">oversized AC<\/a> that&#8217;s too large may short cycle, leaving behind unwanted humidity and uneven temperatures.<\/p>\r\n<p>Open concept homes often include:<\/p>\r\n<ul>\r\n<li>High ceilings<\/li>\r\n<li>Fewer barriers to airflow<\/li>\r\n<li>Large windows<\/li>\r\n<li>Combined-use spaces (kitchen, living, dining)<\/li>\r\n<\/ul>\r\n<p>All of these features increase the cooling load on your system and require accurate AC sizing to maintain consistent comfort.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Factors_That_Impact_AC_Sizing_in_Open_Layouts\"><\/span>Factors That Impact AC Sizing in Open Layouts<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<h3><span class=\"ez-toc-section\" id=\"1_Square_Footage_and_Volume\"><\/span>1. Square Footage and Volume<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Most AC units are sized based on square footage. But in an open concept design, the <em>volume<\/em> of air, including the height of the ceilings, must also be calculated. A 2,000 sq. ft. home with vaulted ceilings may require a more powerful system than one with 8-foot ceilings.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"2_Sun_Exposure_and_Windows\"><\/span>2. Sun Exposure and Windows<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Open concept homes often feature larger windows and skylights, which increase solar heat gain. A proper <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-manual-j-calculation-is-crucial-for-ac-sizing-accuracy\/\">Manual J load calculation<\/a> takes these factors into account when determining AC size.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"3_Airflow_and_Zoning\"><\/span>3. Airflow and Zoning<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>With fewer walls, airflow can be more difficult to control. Some areas may stay cooler than others, especially if ducts or vents are not placed strategically. In some cases, zoned systems or ductless mini-splits may offer better control.<\/p>\r\n<p>Learn more about <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/air-conditioner-sizing-for-zoned-systems\/\">air conditioner sizing for zoned systems<\/a>.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"4_Appliances_and_Occupants\"><\/span>4. Appliances and Occupants<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Because open spaces often include the kitchen, consider how heat-generating appliances like ovens and stoves will affect the temperature load. Likewise, more people in a space equals more body heat, all of which must be considered.<\/p>\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-open-concept-homes-2-300x200.jpg\" alt=\"Expert AC Sizing for Open Concept Homes in St. Louis\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17794\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-open-concept-homes-2-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-open-concept-homes-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2><span class=\"ez-toc-section\" id=\"Expert_AC_Sizing_for_Open_Concept_Homes_in_St_Louis\"><\/span>Expert AC Sizing for Open Concept Homes in St. Louis<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>At Galmiche &#038; Sons, we do more than just install air conditioners. We specialize in designing whole-home comfort solutions tailored to your unique layout and lifestyle. Our AC sizing process includes:<\/p>\r\n<ul>\r\n<li>In-home assessments<\/li>\r\n<li>Accurate Manual J load calculations<\/li>\r\n<li>Customized airflow and ductwork recommendations<\/li>\r\n<li>Equipment selection to match both size and SEER rating goals<\/li>\r\n<\/ul>\r\n<p>With more than 70 years of experience serving homeowners throughout St. Louis and surrounding areas, we know what it takes to keep open spaces cool, efficient, and comfortable, even on the hottest Missouri days.<\/p>\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"FAQs_AC_Sizing_for_Open_Concept_Homes\"><\/span>FAQs: AC Sizing for Open Concept Homes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-68e625513d0a9\"><strong class=\"schema-faq-question\">How do I know if my current system is undersized?<\/strong> <p class=\"schema-faq-answer\">If your AC runs constantly and never reaches the desired temperature, or certain areas remain warm, your unit may be too small for your space.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e625513d0d3\"><strong class=\"schema-faq-question\">Can I use a regular central air conditioner in an open layout?<\/strong> <p class=\"schema-faq-answer\">Yes, but it must be properly sized and installed. In some cases, zoned or ductless systems may provide better comfort and efficiency.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e625513d0e7\"><strong class=\"schema-faq-question\">Will an oversized unit help cool faster?<\/strong> <p class=\"schema-faq-answer\">Not necessarily. Oversized systems often shut off too quickly (called short cycling), which can cause uneven temperatures and excess humidity.<\/p><\/div> <\/div>\n\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"Take_Control_of_Comfort_in_Your_Open_Concept_Home\"><\/span>Take Control of Comfort in Your Open Concept Home<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Your home&#8217;s layout deserves a cooling solution that works as beautifully as the design itself. Don&#8217;t rely on guesswork or generic sizing rules. Trust the experts at Galmiche &#038; Sons for accurate AC sizing for open concept homes and professional installation across the St. Louis area.<\/p>\r\n<p>Contact our heating and air conditioning experts today to schedule your in-home consultation or learn more about our HVAC services. We&#8217;ll help you select the perfect system to keep your space cool, efficient, and exactly how you imagined it.<\/p>","protected":false},"excerpt":{"rendered":"<p>Open concept homes have become incredibly popular for their spaciousness, natural light, and seamless flow between living, dining, and kitchen areas. However, with fewer walls and higher ceilings, these modern layouts pose unique challenges for heating and cooling, particularly when it comes to AC sizing for open concept homes. At Galmiche &#038; Sons, we help homeowners across the St. Louis area get AC sizing right from the start. Whether you are designing a new home or upgrading an older system &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-open-concept-homes\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">AC Sizing for Open Concept Homes in St. Louis: Get Comfort Right in Large Living Spaces<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":17798,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[9,13,5,38],"tags":[],"class_list":["post-17750","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-conditioner-sizing","category-air-conditioner-tips","category-air-conditioners","category-heating-cooling-faqs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AC Sizing for Open Concept Homes | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"Discover the perfect AC sizing for your open concept home in St. Louis! Ensure comfort and efficiency in your spacious living areas. Get a quote today!\" \/>\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\/ac-sizing-for-open-concept-homes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AC Sizing for Open Concept Homes | St. Louis HVAC Tips\" \/>\n<meta property=\"og:description\" content=\"Discover the perfect AC sizing for your open concept home in St. Louis! Ensure comfort and efficiency in your spacious living areas. Get a quote today!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-open-concept-homes\/\" \/>\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=\"2025-06-23T07:03:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-08T08:48:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-open-concept-homes-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\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=\"3 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\\\/ac-sizing-for-open-concept-homes\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/ac-sizing-for-open-concept-homes\\\/\"},\"author\":{\"name\":\"Steve Dulle\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#\\\/schema\\\/person\\\/b90d5d47a6f393d93d6459a9aa8b2fe1\"},\"headline\":\"AC Sizing for Open Concept Homes in St. Louis: Get Comfort Right in Large Living Spaces\",\"datePublished\":\"2025-06-23T07:03:33+00:00\",\"dateModified\":\"2025-10-08T08:48:17+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/ac-sizing-for-open-concept-homes\\\/\"},\"wordCount\":690,\"publisher\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/ac-sizing-for-open-concept-homes\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/ac-sizing-for-open-concept-homes-1.jpg\",\"articleSection\":[\"Air Conditioner Sizing\",\"Air Conditioner Tips\",\"Air Conditioners\",\"Heating &amp; Cooling FAQs\"],\"inLanguage\":\"en-US\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/ac-sizing-for-open-concept-homes\\\/\",\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/ac-sizing-for-open-concept-homes\\\/\",\"name\":\"AC Sizing for Open Concept Homes | St. Louis HVAC Tips\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/ac-sizing-for-open-concept-homes\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/ac-sizing-for-open-concept-homes\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/ac-sizing-for-open-concept-homes-1.jpg\",\"datePublished\":\"2025-06-23T07:03:33+00:00\",\"dateModified\":\"2025-10-08T08:48:17+00:00\",\"description\":\"Discover the perfect AC sizing for your open concept home in St. Louis! 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