{"id":17800,"date":"2025-06-25T05:29:42","date_gmt":"2025-06-25T10:29:42","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=17800"},"modified":"2025-10-08T03:48:16","modified_gmt":"2025-10-08T08:48:16","slug":"air-conditioner-sizing-myths","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/air-conditioner-sizing-myths\/","title":{"rendered":"Top 7 Air Conditioner Sizing Myths That Could Cost You Money"},"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\/air-conditioner-sizing-myths\/#Air_Conditioner_Sizing_Myths_What_You_Should_Know\" >Air Conditioner Sizing Myths: What You Should Know<\/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\/air-conditioner-sizing-myths\/#Myth_1_Bigger_is_Always_Better\" >Myth #1: Bigger is Always Better<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/air-conditioner-sizing-myths\/#Myth_2_You_Can_Estimate_Sizing_by_Square_Footage_Alone\" >Myth #2: You Can Estimate Sizing by Square Footage Alone<\/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\/air-conditioner-sizing-myths\/#Myth_3_All_Sizing_Guides_Are_the_Same\" >Myth #3: All Sizing Guides Are the Same<\/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\/air-conditioner-sizing-myths\/#Myth_4_A_New_AC_Should_Be_the_Same_Size_as_Your_Old_One\" >Myth #4: A New AC Should Be the Same Size as Your Old One<\/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\/air-conditioner-sizing-myths\/#Myth_5_Ductwork_Doesnt_Impact_AC_Sizing\" >Myth #5: Ductwork Doesn&#8217;t Impact AC Sizing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/air-conditioner-sizing-myths\/#Myth_6_One_AC_Size_Fits_All_Homes\" >Myth #6: One AC Size Fits All Homes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/air-conditioner-sizing-myths\/#Myth_7_SEER_Rating_and_Size_Are_Unrelated\" >Myth #7: SEER Rating and Size Are Unrelated<\/a><\/li><\/ul><\/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\/air-conditioner-sizing-myths\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/air-conditioner-sizing-myths\/#Dont_Fall_for_Sizing_Myths_%E2%80%93_Call_the_Experts_at_Galmiche_Sons\" >Don&#8217;t Fall for Sizing Myths &#8211; Call the Experts at Galmiche &#038; Sons<\/a><\/li><\/ul><\/nav><\/div>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/air-conditioner-sizing-myths-1-300x200.jpg\" alt=\"Top 7 Air Conditioner Sizing Myths That Could Cost You Money\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17830\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/air-conditioner-sizing-myths-1-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/air-conditioner-sizing-myths-1.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p>When it comes to staying comfortable during the St. Louis summer heat, the right-sized air conditioner makes all the difference. But many homeowners fall for air conditioner sizing myths that lead to oversized or undersized systems, higher utility bills, and reduced comfort.<\/p>\r\n<p>At Galmiche &#038; Sons, we&#8217;ve seen firsthand how misinformation can lead to expensive mistakes. In this guide, we&#8217;re busting the most common air conditioner sizing myths so you can make smart, informed decisions and avoid wasting money. To learn more about <a href=\"https:\/\/www.galmicheandsons.com\/air-conditioner-sizing.html\">air conditioner sizing<\/a> and for help selecting the best sized unit for your St. Louis home, contact our heating and air conditioning experts today.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Air_Conditioner_Sizing_Myths_What_You_Should_Know\"><\/span>Air Conditioner Sizing Myths: What You Should Know<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<h3><span class=\"ez-toc-section\" id=\"Myth_1_Bigger_is_Always_Better\"><\/span>Myth #1: Bigger is Always Better<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><strong>Truth:<\/strong> A larger AC unit doesn&#8217;t mean better performance. In fact, an oversized <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/watch-out-for-air-conditioner-short-cycling-this-summer\/\">air conditioner will short cycle<\/a>, meaning it turns on and off too frequently. This leads to poor humidity control, uneven cooling, higher energy costs, and added wear and tear on your equipment.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Myth_2_You_Can_Estimate_Sizing_by_Square_Footage_Alone\"><\/span>Myth #2: You Can Estimate Sizing by Square Footage Alone<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><strong>Truth:<\/strong> While square footage is one factor, it&#8217;s not the only one. Ceiling height, insulation quality, number of windows, sun exposure, and layout all affect how much cooling power you actually need. At Galmiche &#038; Sons, we use comprehensive Manual J calculations to determine the correct size for your specific St. Louis home.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Myth_3_All_Sizing_Guides_Are_the_Same\"><\/span>Myth #3: All Sizing Guides Are the Same<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><strong>Truth:<\/strong> Online <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/proper-air-conditioner-sizing-btu-guide\/\">air conditioner sizing BTU<\/a> calculators provide a rough starting point, but they often ignore critical factors like climate, ductwork efficiency, and home design. For accurate results, professional sizing is essential, especially in regions like St. Louis, where both heat and humidity play a major role.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Myth_4_A_New_AC_Should_Be_the_Same_Size_as_Your_Old_One\"><\/span>Myth #4: A New AC Should Be the Same Size as Your Old One<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><strong>Truth:<\/strong> HVAC technology has evolved. If your previous unit was oversized or undersized, duplicating that mistake just continues the problem. Plus, insulation upgrades, new windows, or remodels can change your home&#8217;s cooling load. We always reassess to make sure your new unit is right-sized.<\/p>\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/air-conditioner-sizing-myths-2-300x200.jpg\" alt=\"Air Conditioner Sizing Myths - What You Should Know\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17831\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/air-conditioner-sizing-myths-2-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/air-conditioner-sizing-myths-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h3><span class=\"ez-toc-section\" id=\"Myth_5_Ductwork_Doesnt_Impact_AC_Sizing\"><\/span>Myth #5: Ductwork Doesn&#8217;t Impact AC Sizing<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><strong>Truth:<\/strong> Undersized, leaky, or poorly designed ductwork restricts airflow and can make a properly sized system perform poorly. We evaluate your ductwork as part of the sizing process to ensure the system runs at peak efficiency and comfort.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Myth_6_One_AC_Size_Fits_All_Homes\"><\/span>Myth #6: One AC Size Fits All Homes<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><strong>Truth:<\/strong> Every home is different. A two-story house requires a different cooling strategy than a ranch-style layout. Homes with poor insulation or lots of windows need more cooling power than well-sealed ones. Our team customizes recommendations based on your home&#8217;s unique characteristics.<\/p>\r\n<p>Learn more about <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ac-sizing-for-two-story-homes\/\">AC Sizing for Two-Story Homes vs. Ranch Houses<\/a><\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Myth_7_SEER_Rating_and_Size_Are_Unrelated\"><\/span>Myth #7: SEER Rating and Size Are Unrelated<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p><strong>Truth:<\/strong> While SEER (Seasonal Energy Efficiency Ratio) measures efficiency, it also affects capacity. A high-SEER system can cool more effectively with less energy, which may impact what size you actually need. That&#8217;s why we consider both performance and efficiency when making recommendations.<\/p>\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<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-68e625505da46\"><strong class=\"schema-faq-question\">What happens if I install the wrong AC size?<\/strong> <p class=\"schema-faq-answer\">Too small and it won&#8217;t keep up. Too large and it wastes energy, short cycles, and wears out faster. Either way, comfort suffers and costs increase.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e625505da6f\"><strong class=\"schema-faq-question\">Can I fix sizing problems without replacing my AC?<\/strong> <p class=\"schema-faq-answer\">In some cases, airflow adjustments, zoning systems, or insulation improvements can help. Our team can evaluate your situation and recommend the best solution.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e625505da82\"><strong class=\"schema-faq-question\">Do zoning systems change the required AC size?<\/strong> <p class=\"schema-faq-answer\">Yes. Zoned systems cool specific areas independently, which can allow for smaller, more efficient equipment, if designed properly.<\/p><\/div> <\/div>\n\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"Dont_Fall_for_Sizing_Myths_%E2%80%93_Call_the_Experts_at_Galmiche_Sons\"><\/span>Don&#8217;t Fall for Sizing Myths &#8211; Call the Experts at Galmiche &#038; Sons<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>The right air conditioner sizing isn&#8217;t about guesswork or general rules. It&#8217;s about science, experience, and understanding your home&#8217;s exact needs. At Galmiche &#038; Sons, we&#8217;ve been helping homeowners throughout the St. Louis area choose the right AC for over 75 years.<\/p>\r\n<p><strong>Contact us today<\/strong> to schedule a professional evaluation and avoid costly sizing mistakes. We&#8217;ll help you stay comfortable, save energy, and extend the life of your air conditioning system &#8211; the smart way.<\/p>","protected":false},"excerpt":{"rendered":"<p>When it comes to staying comfortable during the St. Louis summer heat, the right-sized air conditioner makes all the difference. But many homeowners fall for air conditioner sizing myths that lead to oversized or undersized systems, higher utility bills, and reduced comfort. At Galmiche &#038; Sons, we&#8217;ve seen firsthand how misinformation can lead to expensive mistakes. In this guide, we&#8217;re busting the most common air conditioner sizing myths so you can make smart, informed decisions and avoid wasting money. To &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/air-conditioner-sizing-myths\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Top 7 Air Conditioner Sizing Myths That Could Cost You Money<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":17830,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[9,13,5,38,66],"tags":[],"class_list":["post-17800","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","category-hvac-myths"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Air Conditioner Sizing Myths | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"Discover the top 7 air conditioner sizing myths that could cost you money! 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