{"id":17748,"date":"2025-06-23T02:03:13","date_gmt":"2025-06-23T07:03:13","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=17748"},"modified":"2025-10-08T03:48:17","modified_gmt":"2025-10-08T08:48:17","slug":"ac-retrofitting-guide","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-retrofitting-guide\/","title":{"rendered":"AC Retrofitting Guide: Sizing Tips for Retrofitting an Older AC System in St. Louis Homes"},"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-retrofitting-guide\/#Why_AC_Retrofitting_Requires_New_Sizing_Calculations\" >Why AC Retrofitting Requires New Sizing Calculations<\/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-retrofitting-guide\/#How_Galmiche_Sons_Ensures_Accurate_AC_Retrofitting_in_St_Louis\" >How Galmiche &#038; Sons Ensures Accurate AC Retrofitting in St. Louis<\/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-retrofitting-guide\/#The_Benefits_of_Proper_AC_Sizing_During_a_Retrofit\" >The Benefits of Proper AC Sizing During a Retrofit<\/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-retrofitting-guide\/#Better_Comfort\" >Better Comfort<\/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-retrofitting-guide\/#Improved_Energy_Efficiency\" >Improved Energy Efficiency<\/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-retrofitting-guide\/#Extended_System_Lifespan\" >Extended System Lifespan<\/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-retrofitting-guide\/#Common_Pain_Points_We_Solve_During_AC_Retrofitting\" >Common Pain Points We Solve During AC Retrofitting<\/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-retrofitting-guide\/#FAQs_About_AC_Retrofitting_and_Sizing\" >FAQs About AC Retrofitting and Sizing<\/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-retrofitting-guide\/#Retrofit_Your_AC_System_the_Right_Way_with_Galmiche_Sons\" >Retrofit Your AC System the Right Way with Galmiche &#038; Sons<\/a><\/li><\/ul><\/nav><\/div>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-retrofitting-guide-1-300x168.jpg\" alt=\"AC Retrofitting Guide - Sizing Tips for Retrofitting an Older AC System in St. Louis Homes\" width=\"300\" height=\"168\" class=\"alignright size-medium wp-image-17780\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-retrofitting-guide-1-300x168.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-retrofitting-guide-1.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p>When you&#8217;re replacing an older or outdated air conditioning system, simply swapping out the unit for the same size is not always the best solution. Your home&#8217;s cooling needs may have changed due to renovations, insulation upgrades, window replacements, or even evolving climate patterns. That&#8217;s why AC retrofitting is more than just replacing an old unit, it involves recalculating your air conditioner size to ensure optimal comfort, efficiency, and long-term performance.<\/p>\r\n<p>At Galmiche &#038; Sons, we&#8217;ve helped St. Louis homeowners retrofit their HVAC systems for over 70 years. Our licensed technicians perform thorough assessments to ensure your new system is properly matched to your home&#8217;s current demands, not outdated data from decades ago. Contact us for help calculating the best <a href=\"https:\/\/www.galmicheandsons.com\/air-conditioner-sizing.html\">air conditioner sizing<\/a> for your home or to request a quote for your <a href=\"https:\/\/www.galmicheandsons.com\/quote-request.php\">new HVAC system<\/a> installation.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Why_AC_Retrofitting_Requires_New_Sizing_Calculations\"><\/span>Why AC Retrofitting Requires New Sizing Calculations<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Many homeowners mistakenly believe they should replace their AC unit with one that has the same tonnage or capacity. But the reality is that your home&#8217;s cooling load can change significantly over time. Factors that influence updated sizing include:<\/p>\r\n<ul>\r\n<li>Energy-efficient window replacements<\/li>\r\n<li>Added insulation or sealed air leaks<\/li>\r\n<li>Roof replacements or attic ventilation improvements<\/li>\r\n<li>Home additions or layout changes<\/li>\r\n<li>Changing occupancy or usage patterns<\/li>\r\n<li>Age and condition of ductwork<\/li>\r\n<\/ul>\r\n<p>An oversized or undersized AC unit will not only waste energy but can also shorten the life of the system, result in uneven cooling, and leave you with higher utility bills.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"How_Galmiche_Sons_Ensures_Accurate_AC_Retrofitting_in_St_Louis\"><\/span>How Galmiche &#038; Sons Ensures Accurate AC Retrofitting in St. Louis<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>We start every AC retrofit project with a <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-manual-j-calculation-is-crucial-for-ac-sizing-accuracy\/\">Manual J calculation<\/a>, a proven method for determining the precise cooling requirements of your space. This detailed approach looks at:<\/p>\r\n<ul>\r\n<li>Total square footage<\/li>\r\n<li>Ceiling height<\/li>\r\n<li>Number of windows and doors<\/li>\r\n<li>Insulation R-values<\/li>\r\n<li>Solar orientation<\/li>\r\n<li>Internal heat gain (from lights, appliances, and people)<\/li>\r\n<\/ul>\r\n<p>Once we understand your true cooling needs, we can recommend the ideal system size and model to meet those needs efficiently, no more guesswork.<\/p>\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-retrofitting-guide-2-300x200.jpg\" alt=\"Common Pain Points We Solve During AC Retrofitting\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17789\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-retrofitting-guide-2-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/ac-retrofitting-guide-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2><span class=\"ez-toc-section\" id=\"The_Benefits_of_Proper_AC_Sizing_During_a_Retrofit\"><\/span>The Benefits of Proper AC Sizing During a Retrofit<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<h3><span class=\"ez-toc-section\" id=\"Better_Comfort\"><\/span>Better Comfort<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>An AC unit that&#8217;s too large will short cycle, turning on and off too frequently without properly removing humidity. A unit that&#8217;s too small will run continuously but struggle to cool your home. The right-sized system keeps temperatures consistent and humidity under control.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Improved_Energy_Efficiency\"><\/span>Improved Energy Efficiency<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Matching your AC capacity to your home&#8217;s actual demand means fewer wasted cycles, lower energy use, and smaller electricity bills.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Extended_System_Lifespan\"><\/span>Extended System Lifespan<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>An oversized or overworked unit wears out faster. Right-sizing protects your investment, helping your system last longer with fewer repair calls.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Common_Pain_Points_We_Solve_During_AC_Retrofitting\"><\/span>Common Pain Points We Solve During AC Retrofitting<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p><strong>&#8220;My old system never cooled the upstairs well.&#8221;<\/strong><\/p>\r\n<p>We evaluate airflow, ductwork, and system sizing to ensure even comfort across all levels of your home. Learn more about <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-two-story-homes\/\">AC sizing for two-story homes<\/a>.<\/p>\r\n<p><strong>&#8220;We added a room a few years ago but never updated the AC.&#8221;<\/strong><\/p>\r\n<p>We factor in added square footage and usage patterns to ensure your new system accounts for every room. Learn more about <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-home-additions\/\">AC sizing for home additions<\/a>.<\/p>\r\n<p><strong>&#8220;Our bills are too high even though we keep the thermostat reasonable.&#8221;<\/strong><\/p>\r\n<p>Inefficient system sizing or outdated equipment could be the culprit. We help you get the most out of every dollar. Learn the basics of <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/air-conditioner-sizing-101\/\">air conditioner sizing 101<\/a>.<\/p>\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"FAQs_About_AC_Retrofitting_and_Sizing\"><\/span>FAQs About AC Retrofitting and Sizing<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-68e62551cfd82\"><strong class=\"schema-faq-question\">Can I just install a more efficient unit of the same size?<\/strong> <p class=\"schema-faq-answer\">Not always. Efficiency improvements in the home may reduce your cooling needs. A smaller, more efficient system may perform better and save more.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e62551cfdab\"><strong class=\"schema-faq-question\">What if I&#8217;ve improved insulation or added energy-efficient windows?<\/strong> <p class=\"schema-faq-answer\">Great! Those upgrades reduce your cooling load, which we account for when calculating the new system size.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e62551cfdbf\"><strong class=\"schema-faq-question\">How long does the assessment take?<\/strong> <p class=\"schema-faq-answer\">Our in-home evaluation typically takes about 60\u201390 minutes. We use this time to gather accurate data to ensure the right solution.<\/p><\/div> <\/div>\n\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"Retrofit_Your_AC_System_the_Right_Way_with_Galmiche_Sons\"><\/span>Retrofit Your AC System the Right Way with Galmiche &#038; Sons<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>If you&#8217;re upgrading or replacing an outdated air conditioner, don&#8217;t risk choosing the wrong system size. Galmiche &#038; Sons provides professional AC retrofitting in St. Louis with a focus on comfort, energy savings, and long-term reliability.<\/p>\r\n<p>Let our experts guide you through the process and make sure your new AC system is a perfect fit for your home as it stands today. Call us today or schedule a consultation online to get started with a free estimate. Your comfort depends on it.<\/p>","protected":false},"excerpt":{"rendered":"<p>When you&#8217;re replacing an older or outdated air conditioning system, simply swapping out the unit for the same size is not always the best solution. Your home&#8217;s cooling needs may have changed due to renovations, insulation upgrades, window replacements, or even evolving climate patterns. That&#8217;s why AC retrofitting is more than just replacing an old unit, it involves recalculating your air conditioner size to ensure optimal comfort, efficiency, and long-term performance. At Galmiche &#038; Sons, we&#8217;ve helped St. Louis homeowners &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-retrofitting-guide\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">AC Retrofitting Guide: Sizing Tips for Retrofitting an Older AC System in St. Louis Homes<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":17780,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[8,9,13,5,38],"tags":[],"class_list":["post-17748","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-conditioner-replacement","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 v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AC Retrofitting Guide | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"Upgrade your St. Louis home with our AC retrofitting guide! 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