{"id":17302,"date":"2025-04-24T02:40:32","date_gmt":"2025-04-24T07:40:32","guid":{"rendered":"https:\/\/www.galmicheandsons.com\/hvac-blog\/?p=17302"},"modified":"2025-10-08T03:48:27","modified_gmt":"2025-10-08T08:48:27","slug":"when-to-replace-your-air-conditioner","status":"publish","type":"post","link":"https:\/\/www.galmicheandsons.com\/hvac-blog\/when-to-replace-your-air-conditioner\/","title":{"rendered":"When to Replace Your Air Conditioner: Signs You Need a New Air Conditioner Installed ASAP"},"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\/when-to-replace-your-air-conditioner\/#How_Long_Should_an_Air_Conditioner_Last\" >How Long Should an Air Conditioner Last?<\/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\/when-to-replace-your-air-conditioner\/#Common_Signs_You_Need_to_Replace_Your_Air_Conditioner\" >Common Signs You Need to Replace Your Air Conditioner<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/when-to-replace-your-air-conditioner\/#1_Frequent_Repairs_Are_Adding_Up\" >1. Frequent Repairs Are Adding Up<\/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\/when-to-replace-your-air-conditioner\/#2_Your_Energy_Bills_Keep_Rising\" >2. Your Energy Bills Keep Rising<\/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\/when-to-replace-your-air-conditioner\/#3_Uneven_Cooling_or_Weak_Airflow\" >3. Uneven Cooling or Weak Airflow<\/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\/when-to-replace-your-air-conditioner\/#4_Strange_Noises_or_Odors\" >4. Strange Noises or Odors<\/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\/when-to-replace-your-air-conditioner\/#5_Your_AC_Uses_R-22_Refrigerant\" >5. Your AC Uses R-22 Refrigerant<\/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\/when-to-replace-your-air-conditioner\/#6_Your_Home_Comfort_Is_Declining\" >6. Your Home Comfort Is Declining<\/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\/when-to-replace-your-air-conditioner\/#How_Galmiche_Sons_Helps_St_Louis_Homeowners_with_Air_Conditioner_Replacement\" >How Galmiche &#038; Sons Helps St. Louis Homeowners with Air Conditioner Replacement<\/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\/when-to-replace-your-air-conditioner\/#FAQs_When_to_Replace_Your_Air_Conditioner\" >FAQs: When to Replace Your Air Conditioner<\/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\/when-to-replace-your-air-conditioner\/#Get_Expert_AC_Replacement_and_Installation_in_St_Louis\" >Get Expert AC Replacement and 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\/when-to-replace-your-air-conditioner-1-300x200.jpg\" alt=\"When to Replace Your Air Conditioner\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17361\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/when-to-replace-your-air-conditioner-1-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/when-to-replace-your-air-conditioner-1.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p>When summer temperatures climb in St. Louis, your air conditioner becomes one of the most important appliances in your home. But even the most reliable AC unit won&#8217;t last forever. Knowing when to replace your air conditioner can help you avoid unexpected breakdowns and costly repairs during the peak cooling season. At Galmiche &amp; Sons, we combine decades of HVAC experience with industry expertise to help homeowners make smart, timely decisions about their cooling systems.<\/p>\r\n<p>To learn more and for help selecting the best <a href=\"https:\/\/www.galmicheandsons.com\/air-conditioner-units.html\">air conditioner unit<\/a> for your home, contact our St. Louis <a href=\"https:\/\/www.galmicheandsons.com\/contact-galmiche.php\">heating and air conditioning<\/a> experts today.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"How_Long_Should_an_Air_Conditioner_Last\"><\/span>How Long Should an Air Conditioner Last?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>The average lifespan of a central air conditioner is typically between 12 and 17 years. With proper maintenance, some systems may last a bit longer, but most units start showing signs of wear and inefficiency after about a decade. Age is a critical factor, but it isn&rsquo;t the only reason to consider replacement. If you are wondering when to replace your air conditioner, look out for the following signs.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Common_Signs_You_Need_to_Replace_Your_Air_Conditioner\"><\/span>Common Signs You Need to Replace Your Air Conditioner<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<h3><span class=\"ez-toc-section\" id=\"1_Frequent_Repairs_Are_Adding_Up\"><\/span>1. Frequent Repairs Are Adding Up<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>If you find yourself calling for AC repairs multiple times each season, it may be time to stop patching the problem and start thinking about a full replacement. Frequent <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/how-much-does-air-conditioner-repair-cost\/\">air conditioner repair costs<\/a> can quickly add up to more than the value of a new system.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"2_Your_Energy_Bills_Keep_Rising\"><\/span>2. Your Energy Bills Keep Rising<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Older systems are significantly less efficient than today&rsquo;s ENERGY STAR-rated air conditioners. If your <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/tips-to-keep-cool-without-raising-your-ac-bills\/\">AC bills<\/a> are noticeably higher despite no change in usage, your aging AC may be working overtime just to keep up. Replacing it with a modern, high-efficiency unit can reduce your energy costs over time.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"3_Uneven_Cooling_or_Weak_Airflow\"><\/span>3. Uneven Cooling or Weak Airflow<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>If certain rooms in your home are hotter than others, or if you notice <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/air-conditioner-airflow-repair\/\">weak airflow from your vents and air conditioner repair doesn&rsquo;t help<\/a>, your system may be failing. These are signs that components like the blower motor or compressor may be struggling, which often precedes full system failure.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"4_Strange_Noises_or_Odors\"><\/span>4. Strange Noises or Odors<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Clanking, grinding, or rattling noises are more than just annoying. They often indicate internal damage or loose parts. Unpleasant smells, such as burning or musty odors, may signal mold, electrical problems, or burnt-out components. These issues can impact your indoor air quality and overall safety.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"5_Your_AC_Uses_R-22_Refrigerant\"><\/span>5. Your AC Uses R-22 Refrigerant<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>R-22 (also known as Freon) has been phased out due to environmental concerns. If your system still uses this refrigerant, finding <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/r22-refrigerant-phase-out\/\">R22 refrigerant replacements<\/a> for repairs can be difficult and expensive. Upgrading to a new unit that uses environmentally friendly refrigerants is a smart move.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"6_Your_Home_Comfort_Is_Declining\"><\/span>6. Your Home Comfort Is Declining<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>If your AC runs constantly but still doesn&rsquo;t keep your home cool, it&rsquo;s likely no longer up to the task. Older units lose efficiency, making it harder to reach or maintain your desired temperature.<\/p>\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/when-to-replace-your-air-conditioner-2-300x200.jpg\" alt=\"How Galmiche &#038; Sons Helps St. Louis Homeowners with Air Conditioner Replacement\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-17354\" srcset=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/when-to-replace-your-air-conditioner-2-300x200.jpg 300w, https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/when-to-replace-your-air-conditioner-2.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2><span class=\"ez-toc-section\" id=\"How_Galmiche_Sons_Helps_St_Louis_Homeowners_with_Air_Conditioner_Replacement\"><\/span>How Galmiche &#038; Sons Helps St. Louis Homeowners with Air Conditioner Replacement<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Our team at Galmiche &amp; Sons has been serving the Greater St. Louis area for decades. We provide comprehensive AC inspections and can help you determine whether it makes more financial and practical sense to repair or replace your air conditioner. We offer top-quality AC installation services and energy-efficient systems that deliver reliable, long-term comfort.<\/p>\r\n<p>We can help with:<\/p>\r\n<ul>\r\n<li>High utility bills caused by inefficient systems<\/li>\r\n<li>Constant need for emergency AC repairs<\/li>\r\n<li>Poor air distribution or system sizing issues<\/li>\r\n<li>Outdated equipment that can&#8217;t meet modern cooling needs<\/li>\r\n<\/ul>\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"FAQs_When_to_Replace_Your_Air_Conditioner\"><\/span>FAQs: When to Replace Your Air Conditioner<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-68e6255b74c30\"><strong class=\"schema-faq-question\">Should I repair or replace my AC unit?<\/strong> <p class=\"schema-faq-answer\">If your unit is over 10 years old and experiencing frequent issues, replacement is often the better long-term investment.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255b74c5d\"><strong class=\"schema-faq-question\">Can I wait until my AC breaks down before replacing it?<\/strong> <p class=\"schema-faq-answer\">We don&#8217;t recommend it. Waiting can leave you without cooling during the hottest part of the year, and emergency replacements are often more expensive.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255b74c74\"><strong class=\"schema-faq-question\">Will a new AC system save me money?<\/strong> <p class=\"schema-faq-answer\">Yes. Newer models are far more energy-efficient, which can significantly reduce monthly utility bills.<\/p><\/div> <div class=\"schema-faq-section\" id=\"faq-question-68e6255b74c88\"><strong class=\"schema-faq-question\">How do I know what size system I need?<\/strong> <p class=\"schema-faq-answer\">Our technicians will perform a load calculation based on your home&#8217;s size, insulation, and other factors to recommend the properly sized system.<\/p><\/div> <\/div>\n\r\n<hr>\r\n<h2><span class=\"ez-toc-section\" id=\"Get_Expert_AC_Replacement_and_Installation_in_St_Louis\"><\/span>Get Expert AC Replacement and Installation in St. Louis<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>Recognizing the signs of AC failure early helps prevent discomfort and saves you money. If you&#8217;re wondering <strong>when to replace your air conditioner<\/strong>, Galmiche &amp; Sons is here to help. Contact us today to schedule an in-home consultation, <a href=\"https:\/\/www.galmicheandsons.com\/quote-request.php\">request a quote for a new HVAC system<\/a> or learn more about our professional AC installation services in the St. Louis area. Let us help you stay cool and comfortable all summer long.<\/p>","protected":false},"excerpt":{"rendered":"<p>When summer temperatures climb in St. Louis, your air conditioner becomes one of the most important appliances in your home. But even the most reliable AC unit won&#8217;t last forever. Knowing when to replace your air conditioner can help you avoid unexpected breakdowns and costly repairs during the peak cooling season. At Galmiche &amp; Sons, we combine decades of HVAC experience with industry expertise to help homeowners make smart, timely decisions about their cooling systems. To learn more and for &hellip; <a href=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/when-to-replace-your-air-conditioner\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">When to Replace Your Air Conditioner: Signs You Need a New Air Conditioner Installed ASAP<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":17361,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[8,13,42,5,38],"tags":[],"class_list":["post-17302","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-conditioner-replacement","category-air-conditioner-tips","category-air-conditioner-troubleshooting","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>When to Replace Your Air Conditioner | St. Louis HVAC Tips<\/title>\n<meta name=\"description\" content=\"When is it time to replace your air conditioner? Is your AC struggling in the St. Louis heat? Discover key signs it&#039;s time for AC replacement and avoid costly breakdowns. Get expert advice today!\" \/>\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\/when-to-replace-your-air-conditioner\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"When to Replace Your Air Conditioner | St. Louis HVAC Tips\" \/>\n<meta property=\"og:description\" content=\"When is it time to replace your air conditioner? Is your AC struggling in the St. Louis heat? Discover key signs it&#039;s time for AC replacement and avoid costly breakdowns. Get expert advice today!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/when-to-replace-your-air-conditioner\/\" \/>\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=\"2025-04-24T07:40:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-08T08:48:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.galmicheandsons.com\/hvac-blog\/wp-content\/uploads\/when-to-replace-your-air-conditioner-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=\"4 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\\\/when-to-replace-your-air-conditioner\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/when-to-replace-your-air-conditioner\\\/\"},\"author\":{\"name\":\"Steve Dulle\",\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#\\\/schema\\\/person\\\/b90d5d47a6f393d93d6459a9aa8b2fe1\"},\"headline\":\"When to Replace Your Air Conditioner: Signs You Need a New Air Conditioner Installed ASAP\",\"datePublished\":\"2025-04-24T07:40:32+00:00\",\"dateModified\":\"2025-10-08T08:48:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/when-to-replace-your-air-conditioner\\\/\"},\"wordCount\":810,\"publisher\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/when-to-replace-your-air-conditioner\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/when-to-replace-your-air-conditioner-1.jpg\",\"articleSection\":[\"Air Conditioner Replacement\",\"Air Conditioner Tips\",\"Air Conditioner Troubleshooting\",\"Air Conditioners\",\"Heating &amp; Cooling FAQs\"],\"inLanguage\":\"en-US\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/when-to-replace-your-air-conditioner\\\/\",\"url\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/when-to-replace-your-air-conditioner\\\/\",\"name\":\"When to Replace Your Air Conditioner | St. Louis HVAC Tips\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/when-to-replace-your-air-conditioner\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/when-to-replace-your-air-conditioner\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.galmicheandsons.com\\\/hvac-blog\\\/wp-content\\\/uploads\\\/when-to-replace-your-air-conditioner-1.jpg\",\"datePublished\":\"2025-04-24T07:40:32+00:00\",\"dateModified\":\"2025-10-08T08:48:27+00:00\",\"description\":\"When is it time to replace your air conditioner? 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