{"id":17153,"date":"2025-04-14T03:39:29","date_gmt":"2025-04-14T08:39:29","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=17153"},"modified":"2025-10-08T03:48:30","modified_gmt":"2025-10-08T08:48:30","slug":"common-ac-installation-mistakes-to-avoid","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/common-ac-installation-mistakes-to-avoid\/","title":{"rendered":"10 Common AC Installation Mistakes to Avoid"},"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\/common-ac-installation-mistakes-to-avoid\/#1_Choosing_the_Wrong_AC_Unit_Size\" >1. Choosing the Wrong AC Unit Size<\/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\/common-ac-installation-mistakes-to-avoid\/#2_Incorrect_Placement_of_the_Outdoor_Unit\" >2. Incorrect Placement of the Outdoor Unit<\/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\/common-ac-installation-mistakes-to-avoid\/#3_Poor_Ductwork_Installation\" >3. Poor Ductwork Installation<\/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\/common-ac-installation-mistakes-to-avoid\/#4_Improper_Refrigerant_Charge\" >4. Improper Refrigerant Charge<\/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\/common-ac-installation-mistakes-to-avoid\/#5_Ignoring_Proper_Insulation_and_Sealing\" >5. Ignoring Proper Insulation and Sealing<\/a><\/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\/common-ac-installation-mistakes-to-avoid\/#6_Neglecting_Proper_Drainage\" >6. Neglecting Proper Drainage<\/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\/common-ac-installation-mistakes-to-avoid\/#7_Skipping_the_Thermostat_Calibration\" >7. Skipping the Thermostat Calibration<\/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\/common-ac-installation-mistakes-to-avoid\/#8_Not_Testing_the_System_After_Installation\" >8. Not Testing the System After Installation<\/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\/common-ac-installation-mistakes-to-avoid\/#9_Attempting_a_DIY_Installation\" >9. Attempting a DIY Installation<\/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\/common-ac-installation-mistakes-to-avoid\/#10_Hiring_an_Inexperienced_or_Unlicensed_Contractor\" >10. Hiring an Inexperienced or Unlicensed Contractor<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/common-ac-installation-mistakes-to-avoid\/#FAQs_About_AC_Installation_Mistakes\" >FAQs About AC Installation Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/common-ac-installation-mistakes-to-avoid\/#Contact_Galmiche_Sons_for_Expert_AC_Installation_in_St_Louis\" >Contact Galmiche &amp; Sons for Expert AC Installation in St. Louis<\/a><\/li><\/ul><\/nav><\/div>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/common-ac-installation-mistakes-to-avoid-1-300x204.jpg\" alt=\"10 Common AC Installation Mistakes to Avoid\" width=\"300\" height=\"204\" class=\"alignright size-medium wp-image-17216\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/common-ac-installation-mistakes-to-avoid-1-300x204.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/common-ac-installation-mistakes-to-avoid-1.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>\r\n\r\nInstalling a new air conditioning system is a significant investment, and a proper installation ensures maximum efficiency and longevity. Unfortunately, many homeowners and even some inexperienced contractors make avoidable <strong>AC installation mistakes<\/strong>, leading to performance issues and costly repairs. If you are in the St. Louis area and considering a new AC unit, understanding these common mistakes can help you make the right choice for your home.\r\n\r\nTo learn more or for help selecting the best <a href=\"https:\/\/www.galmicheandsons.com\/air-conditioner-units.html\">air conditioner unit<\/a> for your St. Louis area home, contact our HVAC experts today.\r\n<h2><span class=\"ez-toc-section\" id=\"1_Choosing_the_Wrong_AC_Unit_Size\"><\/span>1. Choosing the Wrong AC Unit Size<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nOne of the most critical mistakes in AC installation is selecting a unit that is either too large or too small for your home. An oversized unit will short cycle, leading to higher energy bills and inconsistent cooling, while an undersized unit will struggle to cool your space efficiently. A professional HVAC technician from Galmiche &amp; Sons can perform a load calculation to ensure the <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-to-choose-the-right-size-ac-unit\/\">right-sized AC unit<\/a> for your home.\r\n<h2><span class=\"ez-toc-section\" id=\"2_Incorrect_Placement_of_the_Outdoor_Unit\"><\/span>2. Incorrect Placement of the Outdoor Unit<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nThe placement of the condenser unit plays a crucial role in system efficiency. Installing it in direct sunlight, near obstructions, or too close to walls can restrict airflow and increase operational strain. Ideally, the unit should be placed in a shaded, well-ventilated area to maximize efficiency.\r\n<h2><span class=\"ez-toc-section\" id=\"3_Poor_Ductwork_Installation\"><\/span>3. Poor Ductwork Installation<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nLeaky, poorly sealed, or improperly sized ductwork can lead to energy loss, uneven cooling, and increased strain on the system. Professional <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/ductwork-design-mistakes\/\">ductwork design<\/a> and installation ensures that ducts are sealed, insulated, and appropriately sized for optimal airflow throughout your home.\r\n<h2><span class=\"ez-toc-section\" id=\"4_Improper_Refrigerant_Charge\"><\/span>4. Improper Refrigerant Charge<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nA common AC installation mistake is improper refrigerant levels. Refrigerant levels must be precisely measured and filled according to manufacturer specifications. Too much or too little refrigerant can impact system efficiency, leading to higher energy bills and potential compressor failure. An experienced HVAC technician will ensure that refrigerant levels are properly balanced.\r\n<h2><span class=\"ez-toc-section\" id=\"5_Ignoring_Proper_Insulation_and_Sealing\"><\/span>5. Ignoring Proper Insulation and Sealing<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nA poorly insulated home can cause your AC system to work harder than necessary. Ensuring that doors, windows, and ducts are well-sealed helps maintain a consistent indoor temperature, reducing strain on your system and lowering energy costs.\r\n<h2><span class=\"ez-toc-section\" id=\"6_Neglecting_Proper_Drainage\"><\/span>6. Neglecting Proper Drainage<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nYour AC unit produces condensation that needs to be properly drained. If the drainage system is installed incorrectly or becomes clogged, it can lead to water damage, mold growth, and system failure. Checking and maintaining the condensate drain line is a key part of a professional installation.\r\n\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/common-ac-installation-mistakes-to-avoid-2-300x204.jpg\" alt=\"Contact Us for Expert AC Installation in St. Louis | Avoid AC Installation Mistakes\" width=\"300\" height=\"204\" class=\"alignright size-medium wp-image-17217\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/common-ac-installation-mistakes-to-avoid-2-300x204.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/common-ac-installation-mistakes-to-avoid-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>\r\n<h2><span class=\"ez-toc-section\" id=\"7_Skipping_the_Thermostat_Calibration\"><\/span>7. Skipping the Thermostat Calibration<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nIncorrect thermostat placement or calibration is another common AC installation mistake that can cause inaccurate temperature readings, leading to inefficient cooling cycles. Avoid placing the thermostat near heat sources such as windows, lamps, or kitchens. A properly calibrated and correctly located thermostat ensures optimal system performance.\r\n<h2><span class=\"ez-toc-section\" id=\"8_Not_Testing_the_System_After_Installation\"><\/span>8. Not Testing the System After Installation<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nFailing to test the system post-installation is a common mistake. A professional installer will run thorough tests, checking airflow, refrigerant levels, and overall system operation before finalizing the job. This step ensures everything is functioning correctly from the start.\r\n<h2><span class=\"ez-toc-section\" id=\"9_Attempting_a_DIY_Installation\"><\/span>9. Attempting a DIY Installation<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nWhile DIY projects can save money upfront, attempting an AC installation without proper knowledge and tools can lead to costly AC installation mistakes. A professional HVAC technician understands the necessary permits, codes, and technical details required for a safe and efficient installation.\r\n<h2><span class=\"ez-toc-section\" id=\"10_Hiring_an_Inexperienced_or_Unlicensed_Contractor\"><\/span>10. Hiring an Inexperienced or Unlicensed Contractor<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nChoosing the wrong contractor can lead to improper installation and long-term issues. When selecting an HVAC company in St. Louis, look for licensed, experienced professionals like Galmiche &amp; Sons that follows a strict <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/step-by-step-air-conditioner-installation-guide\/\">air conditioner installation guide<\/a> and process to ensure a quality installation backed by expertise and excellent service.\r\n\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"FAQs_About_AC_Installation_Mistakes\"><\/span>FAQs About AC Installation Mistakes<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-68e6255e71d46\"><strong class=\"schema-faq-question\">How do I know if my AC unit is the right size for my home?<\/strong> <p class=\"schema-faq-answer\">A professional load calculation considers factors like square footage, insulation, and climate conditions to determine the appropriate unit size.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255e71d85\"><strong class=\"schema-faq-question\">What should I do if my AC is short cycling?<\/strong> <p class=\"schema-faq-answer\">Short cycling often results from an oversized unit or thermostat issues. Contact an HVAC expert to assess and fix the problem.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255e71dab\"><strong class=\"schema-faq-question\">Can I install an AC unit myself?<\/strong> <p class=\"schema-faq-answer\">While some homeowners attempt DIY installations, professional installation is highly recommended to ensure efficiency, safety, and compliance with local building codes.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255e71dce\"><strong class=\"schema-faq-question\">How can I avoid refrigerant issues?<\/strong> <p class=\"schema-faq-answer\">Always hire a certified technician who follows manufacturer guidelines for refrigerant charging to prevent overfilling or underfilling.<\/p><\/div> <\/div>\n\r\n\r\n<hr \/>\r\n\r\n<h2><span class=\"ez-toc-section\" id=\"Contact_Galmiche_Sons_for_Expert_AC_Installation_in_St_Louis\"><\/span>Contact Galmiche &amp; Sons for Expert AC Installation in St. Louis<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\nAvoid costly <strong>AC installation mistakes<\/strong> by working with experienced professionals. At Galmiche &amp; Sons, we have decades of expertise in installing high-quality air conditioning systems in the St. Louis area. Contact us today to schedule an installation or <a href=\"https:\/\/www.galmicheandsons.com\/quote-request.php\">request a quote for your new HVAC system installation<\/a>, and ensure your AC operates efficiently for years to come.","protected":false},"excerpt":{"rendered":"<p>Installing a new air conditioning system is a significant investment, and a proper installation ensures maximum efficiency and longevity. Unfortunately, many homeowners and even some inexperienced contractors make avoidable AC installation mistakes, leading to performance issues and costly repairs. If you are in the St. Louis area and considering a new AC unit, understanding these common mistakes can help you make the right choice for your home. To learn more or for help selecting the best air conditioner unit for &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/common-ac-installation-mistakes-to-avoid\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">10 Common AC Installation Mistakes to Avoid<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":17216,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[8,13,5,38],"tags":[],"class_list":["post-17153","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-conditioner-replacement","category-air-conditioner-tips","category-air-conditioners","category-heating-cooling-faqs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Common AC Installation Mistakes to Avoid | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"Discover the 10 common AC installation mistakes to avoid for optimal efficiency and longevity. Ensure your investment pays off with expert tips tailored for St. Louis homeowners.\" \/>\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\/common-ac-installation-mistakes-to-avoid\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Common AC Installation Mistakes to Avoid | St. Louis HVAC Tips\" \/>\n<meta property=\"og:description\" content=\"Discover the 10 common AC installation mistakes to avoid for optimal efficiency and longevity. 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