{"id":17631,"date":"2025-06-05T01:23:23","date_gmt":"2025-06-05T06:23:23","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=17631"},"modified":"2025-10-08T03:48:20","modified_gmt":"2025-10-08T08:48:20","slug":"choosing-the-right-ac-size-for-older-homes-with-poor-insulation","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/","title":{"rendered":"Choosing the Right AC Size for Older Homes with Poor Insulation"},"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\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/#Why_AC_Sizing_Is_Critical_for_Older_St_Louis_Homes\" >Why AC Sizing Is Critical for Older St. Louis Homes<\/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\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/#Why_Poor_Insulation_Affects_AC_Size\" >Why Poor Insulation Affects AC Size<\/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\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/#How_Galmiche_Sons_Determines_the_Right_AC_Size_for_Older_Homes\" >How Galmiche &#038; Sons Determines the Right AC Size for Older Homes<\/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\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/#Factors_We_Evaluate\" >Factors We Evaluate:<\/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\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/#Supplemental_Solutions\" >Supplemental Solutions<\/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\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/#St_Louis_Climate_Considerations\" >St. Louis Climate Considerations<\/a><\/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\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/#FAQs_of_AC_Sizing_for_Older_Homes\" >FAQs of AC Sizing for Older Homes<\/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\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/#Get_Expert_AC_Help_for_Your_Older_St_Louis_Home\" >Get Expert AC Help for Your Older St. Louis Home<\/a><\/li><\/ul><\/nav><\/div>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation-1-300x214.jpg\" alt=\"Choosing the Right AC Size for Older Homes with Poor Insulation\" width=\"300\" height=\"214\" class=\"alignright size-medium wp-image-17668\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation-1-300x214.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation-1.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p>Finding the right AC size for older homes can be a unique challenge. Many historic or mid-century homes in the St. Louis area were built before modern energy codes existed, meaning they often lack the insulation, window efficiency, and airtight construction of newer builds. As a result, these homes tend to lose cool air more quickly, making it difficult for improperly sized air conditioners to keep them comfortable.<\/p>\r\n<p>At Galmiche &#038; Sons, we bring over 70 years of HVAC expertise to the St. Louis area. Our team understands the intricacies of older homes and how to size and install air conditioning systems that meet their unique demands. For more tips on proper <a href=\"https:\/\/www.galmicheandsons.com\/air-conditioner-sizing.html\">air conditioner sizing<\/a> for your home or to schedule an appointment with our <a href=\"https:\/\/www.galmicheandsons.com\/contact-galmiche.php\">heating and air conditioning<\/a> experts, call our team or contact us online today.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Why_AC_Sizing_Is_Critical_for_Older_St_Louis_Homes\"><\/span>Why AC Sizing Is Critical for Older St. Louis Homes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>In well-insulated homes, standard AC sizing formulas based on square footage and occupancy may be sufficient. However, in older homes with leaky windows, minimal wall insulation, and outdated ductwork, these formulas fall short.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Why_Poor_Insulation_Affects_AC_Size\"><\/span>Why Poor Insulation Affects AC Size<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Poor insulation allows conditioned air to escape and hot outdoor air to seep in. This increases the cooling load, or the amount of cooling power needed to keep your home comfortable. If your AC is too small, it will run constantly without reaching the set temperature. If it&#8217;s too large, it may cool the space quickly but fail to remove enough humidity, leaving the air feeling clammy.<\/p>\r\n<p>A properly sized unit tailored to the specific needs of your older home will:<\/p>\r\n<ul>\r\n<li>Improve overall comfort<\/li>\r\n<li>Reduce energy costs<\/li>\r\n<li>Prevent <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/watch-out-for-air-conditioner-short-cycling-this-summer\/\">air conditioner short cycling<\/a><\/li>\r\n<li>Extend equipment lifespan<\/li>\r\n<\/ul>\r\n<h2><span class=\"ez-toc-section\" id=\"How_Galmiche_Sons_Determines_the_Right_AC_Size_for_Older_Homes\"><\/span>How Galmiche &#038; Sons Determines the Right AC Size for Older Homes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>We do not rely on guesswork or one-size-fits-all estimates. Instead, we use industry-standard <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/why-manual-j-calculation-is-crucial-for-ac-sizing-accuracy\/\">Manual J load calculations<\/a>, which consider far more than just square footage.<\/p>\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation-2-300x200.jpg\" alt=\"How Galmiche &#038; Sons Determines the Right AC Size for Older Homes\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17669\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation-2-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>\r\n<h3><span class=\"ez-toc-section\" id=\"Factors_We_Evaluate\"><\/span>Factors We Evaluate:<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul>\r\n<li>Level and type of insulation in walls, attic, and floors<\/li>\r\n<li>Window types, sizes, and orientation<\/li>\r\n<li>Number of floors and layout of the home<\/li>\r\n<li>Amount of air leakage and ventilation<\/li>\r\n<li>Occupant behavior and appliance heat load<\/li>\r\n<\/ul>\r\n<h3><span class=\"ez-toc-section\" id=\"Supplemental_Solutions\"><\/span>Supplemental Solutions<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>In some cases, we may recommend energy-efficiency upgrades such as sealing ductwork, adding attic insulation, or replacing drafty windows. These improvements can lower the necessary cooling capacity, allowing you to install a smaller, more efficient system.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"St_Louis_Climate_Considerations\"><\/span>St. Louis Climate Considerations<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>In a region like St. Louis, where summers are hot and humid, older homes are especially vulnerable to temperature swings. Choosing the wrong AC size for an older home can result in poor humidity control and discomfort during peak heat.<\/p>\r\n<p>Our local experience ensures your system is not only appropriately sized but also designed to perform reliably during the extremes of our Midwest climate.<\/p>\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"FAQs_of_AC_Sizing_for_Older_Homes\"><\/span>FAQs of AC Sizing for Older 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-68e625547355c\"><strong class=\"schema-faq-question\">Can I just get a bigger AC unit to stay comfortable in my old home?<\/strong> <p class=\"schema-faq-answer\">Bigger is not always better. Oversized units can short cycle, reduce efficiency, and fail to remove humidity properly. Accurate sizing is critical.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255473585\"><strong class=\"schema-faq-question\">What if I cannot afford major insulation upgrades?<\/strong> <p class=\"schema-faq-answer\">We can often recommend targeted, affordable improvements to help reduce load and improve comfort without requiring a full retrofit.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255473598\"><strong class=\"schema-faq-question\">Does ductwork matter when sizing a new system?<\/strong> <p class=\"schema-faq-answer\">Yes. Older duct systems are often undersized or leaky, which can restrict airflow and reduce AC efficiency. We inspect your ductwork as part of the system evaluation.<\/p><\/div> <\/div>\n\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"Get_Expert_AC_Help_for_Your_Older_St_Louis_Home\"><\/span>Get Expert AC Help for Your Older St. Louis Home<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>If you live in an older or historic home in the St. Louis area, trust Galmiche &#038; Sons to guide you through the AC sizing process with precision and care. We specialize in helping homeowners find reliable, energy-efficient solutions that work within the limitations of older construction.<\/p>\r\n<p><strong>Contact Galmiche &#038; Sons today<\/strong> to schedule a comfort consultation or learn more about air conditioning upgrades for older homes. Our expert team is ready to help you stay cool and comfortable all summer long.<\/p>","protected":false},"excerpt":{"rendered":"<p>Finding the right AC size for older homes can be a unique challenge. Many historic or mid-century homes in the St. Louis area were built before modern energy codes existed, meaning they often lack the insulation, window efficiency, and airtight construction of newer builds. As a result, these homes tend to lose cool air more quickly, making it difficult for improperly sized air conditioners to keep them comfortable. At Galmiche &#038; Sons, we bring over 70 years of HVAC expertise &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Choosing the Right AC Size for Older Homes with Poor Insulation<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":17668,"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-17631","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>Choosing the Right AC Size for Older Homes | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"Struggling to find the right AC size for your older home? Discover expert tips from Galmiche &amp; Sons to ensure comfort and efficiency in historic homes.\" \/>\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\/choosing-the-right-ac-size-for-older-homes-with-poor-insulation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Choosing the Right AC Size for Older Homes | St. Louis HVAC Tips\" \/>\n<meta property=\"og:description\" content=\"Struggling to find the right AC size for your older home? 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