{"id":17688,"date":"2025-06-13T02:32:12","date_gmt":"2025-06-13T07:32:12","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=17688"},"modified":"2025-10-08T03:48:19","modified_gmt":"2025-10-08T08:48:19","slug":"ac-sizing-for-home-additions","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-home-additions\/","title":{"rendered":"AC Sizing for Home Additions: What You Need to Know When Adding a Room or Remodeling"},"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-home-additions\/#Plan_Ahead_to_Keep_Every_Square_Foot_Comfortable\" >Plan Ahead to Keep Every Square Foot Comfortable<\/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-home-additions\/#Why_AC_Sizing_Changes_with_Square_Footage\" >Why AC Sizing Changes with Square Footage<\/a><\/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\/ac-sizing-for-home-additions\/#How_to_Evaluate_AC_Sizing_for_Home_Additions\" >How to Evaluate AC Sizing for Home Additions<\/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\/ac-sizing-for-home-additions\/#Step_1_Assess_Your_Existing_Systems_Capacity\" >Step 1: Assess Your Existing System&#8217;s Capacity<\/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-home-additions\/#Step_2_Calculate_Additional_Cooling_Load\" >Step 2: Calculate Additional Cooling Load<\/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-home-additions\/#Step_3_Explore_Your_Options\" >Step 3: Explore Your Options<\/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-home-additions\/#Common_Pain_Points_We_Help_Homeowners_Solve\" >Common Pain Points We Help Homeowners Solve<\/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-home-additions\/#FAQs_About_AC_Sizing_for_Home_Additions\" >FAQs About AC Sizing for Home Additions<\/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-home-additions\/#Dont_Let_a_New_Room_Ruin_Your_Homes_Comfort\" >Don&#8217;t Let a New Room Ruin Your Home&#8217;s Comfort<\/a><\/li><\/ul><\/nav><\/div>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-home-additions-1-300x183.jpg\" alt=\"AC Sizing for Home Additions\" width=\"300\" height=\"183\" class=\"alignright size-medium wp-image-17726\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-home-additions-1-300x183.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-home-additions-1-1024x623.jpg 1024w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-home-additions-1.jpg 1200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2><span class=\"ez-toc-section\" id=\"Plan_Ahead_to_Keep_Every_Square_Foot_Comfortable\"><\/span>Plan Ahead to Keep Every Square Foot Comfortable<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>When planning a home addition, sunroom, garage conversion, or major remodel, most homeowners focus on layout, finishes, and functionality. But one of the most overlooked yet critical steps is ensuring your air conditioner can keep up with the added space. At Galmiche &#038; Sons, we help homeowners throughout the St. Louis area correctly assess their HVAC needs when expanding their homes. In this guide, we break down what you need to know about AC sizing for home additions so you can avoid comfort issues, inflated energy bills, and costly fixes down the road.<\/p>\r\n<p>To learn more <a href=\"https:\/\/www.galmicheandsons.com\/air-conditioner-sizing.html\">air conditioner sizing<\/a> tips or request a quote for a <a href=\"https:\/\/www.galmicheandsons.com\/quote-request.php\">new HVAC system<\/a> when upgrading or remodeling your home, contact us today.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Why_AC_Sizing_Changes_with_Square_Footage\"><\/span>Why AC Sizing Changes with Square Footage<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Your current AC system was designed for your original home&#8217;s square footage. Adding just 300 to 500 square feet, whether it&#8217;s a new bedroom, sunroom, or expanded kitchen, increases the cooling load. If your system isn&#8217;t updated to account for this, you may end up with:<\/p>\r\n<ul>\r\n<li>Hot or stuffy new rooms<\/li>\r\n<li>Reduced efficiency in your entire home<\/li>\r\n<li>Frequent cycling or early breakdowns<\/li>\r\n<li>Increased utility costs<\/li>\r\n<\/ul>\r\n<p>Adding square footage without adjusting your system is like expecting a small engine to power a larger vehicle. It might work, but it won&#8217;t work well, or for long.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"How_to_Evaluate_AC_Sizing_for_Home_Additions\"><\/span>How to Evaluate AC Sizing for Home Additions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<h3><span class=\"ez-toc-section\" id=\"Step_1_Assess_Your_Existing_Systems_Capacity\"><\/span>Step 1: Assess Your Existing System&#8217;s Capacity<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Have an HVAC technician inspect your system to determine its current capacity and performance. Many homeowners are surprised to learn that their system was already working near its limit before the addition.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Step_2_Calculate_Additional_Cooling_Load\"><\/span>Step 2: Calculate Additional Cooling Load<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Each added room will increase the BTU (British Thermal Unit) demand on your system. Key factors include:<\/p>\r\n<ul>\r\n<li>Square footage of the addition<\/li>\r\n<li>Ceiling height<\/li>\r\n<li>Number and direction of windows<\/li>\r\n<li>Insulation quality<\/li>\r\n<li>How the room will be used (e.g., bedrooms vs. sunrooms)<\/li>\r\n<\/ul>\r\n<p>Our team performs a full <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-manual-j-calculation-is-crucial-for-ac-sizing-accuracy\/\">Manual J load calculation<\/a> to ensure we get accurate sizing based on all of these elements.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Step_3_Explore_Your_Options\"><\/span>Step 3: Explore Your Options<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Depending on your home&#8217;s needs and the size of the addition, you may:<\/p>\r\n<ul>\r\n<li><strong>Upgrade to a larger central AC unit<\/strong><\/li>\r\n<li><strong>Add a second unit for zoning<\/strong> (common in two-story homes)<\/li>\r\n<li><strong>Install a <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/when-ductless-mini-splits-are-best-hvac-system\/\">ductless mini-split<\/a><\/strong> for the new space<\/li>\r\n<li><strong><a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/is-ductwork-replacement-necessary\/\">Ductwork replacement<\/a><\/strong> for improved airflow to the new room<\/li>\r\n<\/ul>\r\n<p>Each approach has pros and cons. At Galmiche &#038; Sons, we guide you to the most efficient, cost-effective option based on your home and budget.<\/p>\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-home-additions-2-300x225.jpg\" alt=\"FAQs About AC Sizing for Home Additions\" width=\"300\" height=\"225\" class=\"alignright size-medium wp-image-17725\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-home-additions-2-300x225.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-sizing-for-home-additions-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2><span class=\"ez-toc-section\" id=\"Common_Pain_Points_We_Help_Homeowners_Solve\"><\/span>Common Pain Points We Help Homeowners Solve<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<ul>\r\n<li><strong>&#8220;My new room is always too warm in the summer.&#8221;<\/strong>\r\nThis usually means your current AC can&#8217;t keep up. We help determine whether an upgrade or zone cooling solution is best.<\/li>\r\n<li><strong>&#8220;I don&#8217;t want to tear out my walls for ductwork.&#8221;<\/strong>\r\nNo problem. Ductless mini-split systems offer powerful, efficient cooling without invasive installation.<\/li>\r\n<li><strong>&#8220;I already spent so much on the remodel, do I have to replace my entire system?&#8221;<\/strong>\r\nNot necessarily. Our team evaluates all options and may be able to offer a partial upgrade or ductless solution to keep costs down.<\/li>\r\n<\/ul>\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"FAQs_About_AC_Sizing_for_Home_Additions\"><\/span>FAQs About AC Sizing for Home Additions<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-68e6255380c46\"><strong class=\"schema-faq-question\">Can I just extend my existing ducts into the new space?<\/strong> <p class=\"schema-faq-answer\">Sometimes, yes, but only if your current system has enough capacity. Otherwise, this could compromise performance throughout the home.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255380c81\"><strong class=\"schema-faq-question\">Do I need a separate thermostat for the addition?<\/strong> <p class=\"schema-faq-answer\">If you&#8217;re using a mini-split or zoning system, a separate thermostat or controller can help manage comfort in that space independently.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255380c9f\"><strong class=\"schema-faq-question\">Will adding a mini-split affect my home&#8217;s energy efficiency?<\/strong> <p class=\"schema-faq-answer\">Quite the opposite. Mini-splits are some of the most energy-efficient systems on the market and are ideal for single-room applications.<\/p><\/div> <\/div>\n\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"Dont_Let_a_New_Room_Ruin_Your_Homes_Comfort\"><\/span>Don&#8217;t Let a New Room Ruin Your Home&#8217;s Comfort<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Whether you&#8217;re finishing a basement, adding a bedroom, or converting a garage, HVAC planning is a critical part of the process. When it comes to AC sizing for home additions or remodels, let Galmiche &#038; Sons help you get it right from the start.<\/p>\r\n<p>We&#8217;ve been serving the St. Louis area since 1950 with trusted, expert HVAC solutions. Our team can evaluate your current system, recommend the best path forward, and install your upgrade with precision.<\/p>\r\n<p><strong>Contact our <a href=\"https:\/\/www.galmicheandsons.com\/contact-galmiche.php\">heating and air conditioning<\/a> experts today to schedule a consultation or learn more about your options for AC sizing for home additions. Don&#8217;t wait until your new space is uncomfortably warm, plan your cooling system right the first time<\/strong>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Plan Ahead to Keep Every Square Foot Comfortable When planning a home addition, sunroom, garage conversion, or major remodel, most homeowners focus on layout, finishes, and functionality. But one of the most overlooked yet critical steps is ensuring your air conditioner can keep up with the added space. At Galmiche &#038; Sons, we help homeowners throughout the St. Louis area correctly assess their HVAC needs when expanding their homes. In this guide, we break down what you need to know &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-home-additions\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">AC Sizing for Home Additions: What You Need to Know When Adding a Room or Remodeling<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":17726,"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-17688","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 Home Additions | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"AC Sizing for Home Additions is a careful process. Learn how to size your AC correctly with our expert guide. Avoid costly mistakes and inflated bills 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-home-additions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AC Sizing for Home Additions | St. Louis HVAC Tips\" \/>\n<meta property=\"og:description\" content=\"AC Sizing for Home Additions is a careful process. Learn how to size your AC correctly with our expert guide. 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