{"id":17805,"date":"2025-06-25T05:30:19","date_gmt":"2025-06-25T10:30:19","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=17805"},"modified":"2025-10-08T03:48:15","modified_gmt":"2025-10-08T08:48:15","slug":"humidity-and-ac-sizing","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/humidity-and-ac-sizing\/","title":{"rendered":"Humidity and AC Sizing: How Humidity Levels Influence the Right Air Conditioner Size"},"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\/humidity-and-ac-sizing\/#Why_Humidity_Matters_in_AC_Sizing\" >Why Humidity Matters in AC Sizing<\/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\/humidity-and-ac-sizing\/#Signs_Your_AC_May_Not_Be_Handling_Humidity_Properly\" >Signs Your AC May Not Be Handling Humidity Properly<\/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\/humidity-and-ac-sizing\/#Our_Expert_Approach_to_AC_Sizing_in_St_Louis\" >Our Expert Approach to AC Sizing in St. Louis<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/humidity-and-ac-sizing\/#FAQs_About_Humidity_and_AC_Sizing\" >FAQs About Humidity and AC Sizing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/humidity-and-ac-sizing\/#Let_Galmiche_Sons_Help_You_Get_AC_Sizing_Right\" >Let Galmiche &#038; Sons Help You Get AC Sizing Right<\/a><\/li><\/ul><\/nav><\/div>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/humidity-and-ac-sizing-1-300x200.jpg\" alt=\"Humidity and AC Sizing: How Humidity Levels Influence the Right Air Conditioner Size\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17838\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/humidity-and-ac-sizing-1-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/humidity-and-ac-sizing-1.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p>When homeowners in the St. Louis area shop for a new air conditioner, most assume that square footage alone determines the right AC size. But there&#8217;s a crucial factor often overlooked &#8211; humidity. In our Midwestern climate, moisture control is just as important as temperature control. If your system isn&#8217;t properly sized to handle both, you could face major comfort issues, high energy bills, and even mold or mildew problems.<\/p>\r\n<p>At Galmiche &#038; Sons, we have over 70 years of experience helping St. Louis families choose AC systems that are tailored to both their home&#8217;s size and humidity levels. Understanding how humidity affects AC sizing is key to keeping your indoor environment cool, comfortable, and healthy.<\/p>\r\n<p>To learn more about proper <a href=\"https:\/\/www.galmicheandsons.com\/air-conditioner-sizing.html\">air conditioner sizing<\/a> for your St. Louis home, contact the experts at Galmiche &#038; Sons today.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Why_Humidity_Matters_in_AC_Sizing\"><\/span>Why Humidity Matters in AC Sizing<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Humidity refers to the amount of moisture in the air. During hot and humid summers in St. Louis, excess moisture makes your home feel warmer than it actually is. The air feels sticky and uncomfortable, and your AC has to work overtime, not just to cool the space, but also to remove moisture from the air.<\/p>\r\n<p>An air conditioner doesn&#8217;t just lower temperatures. It also acts as a dehumidifier. If your system is too large, it may cool the air quickly but shut off before it has time to remove enough humidity. That&#8217;s a common issue known as short cycling, which leads to cold but clammy rooms.<\/p>\r\n<p>If your system is too small, it might run constantly, struggling to keep up with both temperature and moisture removal, leading to higher utility costs and added wear on the system.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Signs_Your_AC_May_Not_Be_Handling_Humidity_Properly\"><\/span>Signs Your AC May Not Be Handling Humidity Properly<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<ul>\r\n<li>Your home feels cool but still damp or sticky<\/li>\r\n<li>Musty odors, especially in basements or closets<\/li>\r\n<li>Higher-than-average cooling bills<\/li>\r\n<li>Frequent cycling on and off (for oversized systems)<\/li>\r\n<li>Constant operation without reaching the desired comfort (for undersized systems)<\/li>\r\n<\/ul>\r\n<p>If any of these sound familiar, it&#8217;s likely your air conditioner is not properly sized for your home&#8217;s humidity levels. If your air conditioner is not enough, you may also need to consider adding a dehumidifier to your St. Louis home.<\/p>\r\n<p>Learn more about common <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/signs-you-need-a-dehumidifier-for-your-ac\/\">signs you a dehumidifier for your AC<\/a>.<\/p>\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/humidity-and-ac-sizing-2-300x200.jpg\" alt=\"FAQs About Humidity and AC Sizing\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17839\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/humidity-and-ac-sizing-2-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/humidity-and-ac-sizing-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2><span class=\"ez-toc-section\" id=\"Our_Expert_Approach_to_AC_Sizing_in_St_Louis\"><\/span>Our Expert Approach to AC Sizing in St. Louis<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>At Galmiche &#038; Sons, we don&#8217;t believe in one-size-fits-all solutions. We perform a complete <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/manual-j-load-calculation\/\">Manual J load calculation<\/a> that accounts for:<\/p>\r\n<ul>\r\n<li>Total square footage<\/li>\r\n<li>Ceiling height and room volume<\/li>\r\n<li>Number of windows and their orientation<\/li>\r\n<li>Insulation levels<\/li>\r\n<li>Occupant usage<\/li>\r\n<li>Moisture loads from kitchens, bathrooms, and basements<\/li>\r\n<li>Local humidity trends in the St. Louis area<\/li>\r\n<\/ul>\r\n<p>This thorough process ensures that your new system is sized not just for your home&#8217;s cooling load, but also for its dehumidification needs.<\/p>\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"FAQs_About_Humidity_and_AC_Sizing\"><\/span>FAQs About Humidity and AC 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-68e6254f47cd6\"><strong class=\"schema-faq-question\">Does a bigger AC system remove humidity faster?<\/strong> <p class=\"schema-faq-answer\">Not necessarily. Oversized systems often cool air too quickly and shut off before moisture can be removed effectively. A right-sized system that runs longer and more consistently provides better humidity control.\r\n\r\nLearn more about <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/oversized-ac-unit-problems\/\">Oversized AC Unit Problems<\/a>.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6254f47d00\"><strong class=\"schema-faq-question\">Can I use a dehumidifier with my AC?<\/strong> <p class=\"schema-faq-answer\"><\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6254f47d1c\"><strong class=\"schema-faq-question\">How do I know if my current system is too big or too small?<\/strong> <p class=\"schema-faq-answer\">Schedule an inspection with our team. We&#8217;ll evaluate your current system&#8217;s performance and compare it to your home&#8217;s actual needs.<\/p><\/div> <\/div>\n\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"Let_Galmiche_Sons_Help_You_Get_AC_Sizing_Right\"><\/span>Let Galmiche &#038; Sons Help You Get AC Sizing Right<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>If you&#8217;re planning to install or replace an air conditioner, don&#8217;t underestimate the role humidity plays in sizing decisions. Choosing the wrong system could mean years of discomfort and higher energy bills. Our expert technicians at Galmiche &#038; Sons provide customized AC sizing services to ensure your home stays cool, dry, and energy-efficient, even during St. Louis&#8217; most humid months.<\/p>\r\n<p><strong>Contact us today<\/strong> to schedule your AC consultation or learn more about our installation services. Let us help you find the right size system for your comfort and peace of mind.<\/p>","protected":false},"excerpt":{"rendered":"<p>When homeowners in the St. Louis area shop for a new air conditioner, most assume that square footage alone determines the right AC size. But there&#8217;s a crucial factor often overlooked &#8211; humidity. In our Midwestern climate, moisture control is just as important as temperature control. If your system isn&#8217;t properly sized to handle both, you could face major comfort issues, high energy bills, and even mold or mildew problems. At Galmiche &#038; Sons, we have over 70 years of &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/humidity-and-ac-sizing\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Humidity and AC Sizing: How Humidity Levels Influence the Right Air Conditioner Size<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":17838,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[9,13,5,23,38],"tags":[],"class_list":["post-17805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-conditioner-sizing","category-air-conditioner-tips","category-air-conditioners","category-dehumidifiers","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>Humidity and AC Sizing | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"Discover how humidity impacts AC sizing in St. Louis! 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Learn to choose the right air conditioner for comfort and energy efficiency.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/humidity-and-ac-sizing\/\" \/>\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=\"2025-06-25T10:30:19+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-08T08:48:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/humidity-and-ac-sizing-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"600\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\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\\\/humidity-and-ac-sizing\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/humidity-and-ac-sizing\\\/\"},\"author\":{\"name\":\"Steve Dulle\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#\\\/schema\\\/person\\\/b90d5d47a6f393d93d6459a9aa8b2fe1\"},\"headline\":\"Humidity and AC Sizing: How Humidity Levels Influence the Right Air Conditioner Size\",\"datePublished\":\"2025-06-25T10:30:19+00:00\",\"dateModified\":\"2025-10-08T08:48:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/humidity-and-ac-sizing\\\/\"},\"wordCount\":681,\"publisher\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/humidity-and-ac-sizing\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/humidity-and-ac-sizing-1.jpg\",\"articleSection\":[\"Air Conditioner Sizing\",\"Air Conditioner Tips\",\"Air Conditioners\",\"Dehumidifiers\",\"Heating &amp; Cooling FAQs\"],\"inLanguage\":\"en-US\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/humidity-and-ac-sizing\\\/\",\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/humidity-and-ac-sizing\\\/\",\"name\":\"Humidity and AC Sizing | St. Louis HVAC Tips\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/humidity-and-ac-sizing\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/humidity-and-ac-sizing\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/humidity-and-ac-sizing-1.jpg\",\"datePublished\":\"2025-06-25T10:30:19+00:00\",\"dateModified\":\"2025-10-08T08:48:15+00:00\",\"description\":\"Discover how humidity impacts AC sizing in St. Louis! 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