{"id":105558,"date":"2025-09-05T11:50:39","date_gmt":"2025-09-05T18:50:39","guid":{"rendered":"https:\/\/www.redfin.com\/blog\/?p=105558"},"modified":"2025-09-17T14:17:46","modified_gmt":"2025-09-17T21:17:46","slug":"how-to-find-air-leaks-in-house","status":"publish","type":"post","link":"https:\/\/www.redfin.com\/blog\/how-to-find-air-leaks-in-house\/","title":{"rendered":"How to Find Air Leaks in Your House"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Whether you live in a hot, dry climate like <\/span><a href=\"https:\/\/www.redfin.com\/city\/14240\/AZ\/Phoenix\" data-wpel-link=\"exclude\"><span style=\"font-weight: 400;\">Phoenix<\/span><\/a><span style=\"font-weight: 400;\"> or a cold, snowy one like <\/span><a href=\"https:\/\/www.redfin.com\/city\/1826\/MA\/Boston\" data-wpel-link=\"exclude\"><span style=\"font-weight: 400;\">Boston<\/span><\/a><span style=\"font-weight: 400;\">, air leaks can quickly drive up your heating and cooling costs. Your HVAC system works hard to keep you comfortable year-round, but if conditioned air is escaping through gaps and cracks, you\u2019re essentially paying to heat or cool the outdoors.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here\u2019s how to find air leaks in your home and fix them, so you can stay comfortable and save money.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">How to find air leaks in your house<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">There are four main methods that are used to detect <a href=\"https:\/\/www.energy.gov\/energysaver\/detecting-air-leaks\" data-wpel-link=\"external\" target=\"_blank\" rel=\"external noopener noreferrer\">air leaks in a house<\/a>:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Visual inspections<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Blower door tests<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Building pressurization tests<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/www.redfin.com\/blog\/home-energy-audit-checklist\/\" data-wpel-link=\"exclude\"><span style=\"font-weight: 400;\">Home energy audits<\/span><\/a><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Below, we\u2019ll go into detail about how each of these processes work and how they can help you find air leaks throughout your home.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">1. Detect an air leak with a visual inspection of your home<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The simplest way to find air leaks is to simply take a look around. A thorough visual inspection can help you find areas throughout your home that might be allowing air to escape. The best thing about this method of detecting leaks is that it\u2019s totally free, and homeowners can do their own inspection if they know where to look. Common sources of air leaks include:<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Common sources of air leaks<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Electrical outlets<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Switch plates<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Door and window frames<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Baseboards<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Weather stripping around doors<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dryer vents<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/www.redfin.com\/blog\/install-recessed-lighting-before-listing-your-home\/\" data-wpel-link=\"exclude\"><span style=\"font-weight: 400;\">Recessed lights<\/span><\/a><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">2. Call in the pros to conduct a blower door test<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">When it comes to air leak detection, the <a href=\"https:\/\/www.energy.gov\/energysaver\/blower-door-tests\" data-wpel-link=\"external\" target=\"_blank\" rel=\"external noopener noreferrer\">blower door test<\/a> is probably the most accurate and widely used method by professional energy assessors. Simply put, the blower door test works by pulling air out of the house, lowering the pressure inside. Because of the pressure difference this creates, the air on the outside flows into the house through any unsealed gaps.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This process can also work in reverse, with the blower door increasing the pressure in the house and leaks being detected by analyzing where the air escapes from.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">There are two types:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Calibrated blower doors<\/b><span style=\"font-weight: 400;\">: measure exactly how much air is escaping.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Uncalibrated blower doors<\/b><span style=\"font-weight: 400;\">: show you where leaks are, but not how severe they are.<\/span><\/li>\n<\/ul>\n<p><b>Cost tip:<\/b><span style=\"font-weight: 400;\"> Expect to pay $300\u2013$500 for a professional test. Some utility companies offer them for free or at a discount.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">3. Try a building pressurization test for DIY air leak detection<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Though not quite as comprehensive or successful as the blower door test, the building pressurization test is another great way for homeowners to detect areas where air is leaking. After conducting a visual assessment of your home and identifying potential leaks, this test can let you know if you\u2019re losing efficiency.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To conduct a pressurization test:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Shut off all combustion appliances (gas furnaces, water heaters)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Close all windows and doors<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn on all exhaust fans that blow outside (drying machine, bathroom fans, stove vents)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Light an incense stick and hold it near potential leaks; if the smoke is blown into the room or sucked out, then there\u2019s an air leakage<\/span><\/li>\n<\/ol>\n<p><b>Safety tip:<\/b><span style=\"font-weight: 400;\"> Keep incense away from flammable surfaces, or use a handheld draft detector instead.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">4. Get a complete evaluation of your house with a home energy audit<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A <\/span><a href=\"https:\/\/www.energy.gov\/energysaver\/home-energy-assessments\" data-wpel-link=\"external\" target=\"_blank\" rel=\"external noopener noreferrer\"><span style=\"font-weight: 400;\">home energy audit<\/span><\/a><span style=\"font-weight: 400;\"> assesses your home\u2019s energy use while finding any inefficiencies, including air leaks. Auditors often use blower doors, infrared cameras, and moisture meters to get a full picture of your home\u2019s energy performance. This can be especially helpful if you\u2019re planning insulation upgrades or want a prioritized list of fixes.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Why is it important to find air leaks in your home?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Detecting air leaks throughout your home is an important step in maximizing its efficiency and <\/span><a href=\"https:\/\/www.redfin.com\/blog\/how-to-save-energy-and-reduce-waste-at-home\/\" data-wpel-link=\"exclude\"><span style=\"font-weight: 400;\">saving energy<\/span><\/a><span style=\"font-weight: 400;\">. According to a study from the <\/span><span style=\"font-weight: 400;\">Environmental Protection Agency (EPA)<\/span><span style=\"font-weight: 400;\">, <a href=\"https:\/\/www.energystar.gov\/saveathome\/seal_insulate\/methodology\" data-wpel-link=\"external\" target=\"_blank\" rel=\"external noopener noreferrer\">homeowners can save an average of 15%<\/a> on their heating and cooling costs by adding proper insulation. Finding and addressing air leaks is not only key to maintaining a comfortable home, but also a smart investment that can save you money down the line.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">How to fix air leaks<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Once you\u2019ve found the leaks in your home, seal them with the right materials for each location:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Caulk<\/b><span style=\"font-weight: 400;\"> small cracks and gaps around trim, baseboards, and window frames.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Weather strip<\/b><span style=\"font-weight: 400;\"> exterior doors, attic hatches, and movable windows.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Install door sweeps<\/b><span style=\"font-weight: 400;\"> to block drafts at the bottom of doors.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Use spray foam<\/b><span style=\"font-weight: 400;\"> for larger gaps around pipes and vents.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Insulate attic access points and recessed lighting fixtures<\/b><span style=\"font-weight: 400;\"> (if safe for contact with insulation).<\/span><\/li>\n<\/ul>\n<p><b>DIY vs. pro tip:<\/b><span style=\"font-weight: 400;\"> Most small sealing projects are DIY-friendly, but for major leaks in attics, basements, or crawl spaces, consider hiring a pro for safety and effectiveness.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Final word on detecting air leaks in your house<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">No one wants to be uncomfortable in their own home, especially when the source is costing you hard-earned dollars and is entirely avoidable. If you notice a draft in your house or think your energy bill is higher than it should be, now might be the time to take a look around and identify any possible air leaks.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learning how to find air leaks in your house is a critical step to improving its energy efficiency and lowering your energy bills.<\/p>\n","protected":false},"author":557,"featured_media":105577,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[34278],"tags":[4267],"coauthors":[34341],"class_list":["post-105558","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-home-improvement","tag-home-maintenance-improvement"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.7 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to Find Air Leaks in Your House | Redfin<\/title>\n<meta name=\"description\" content=\"Learning how to find air leaks in your house is a critical step to improving its energy efficiency and lowering your energy bills.\" \/>\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.redfin.com\/blog\/how-to-find-air-leaks-in-house\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Find Air Leaks in Your House\" \/>\n<meta property=\"og:description\" content=\"Learning how to find air leaks in your house is a critical step to improving its energy efficiency and lowering your energy bills.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.redfin.com\/blog\/how-to-find-air-leaks-in-house\/\" \/>\n<meta property=\"og:site_name\" content=\"Redfin | Real Estate Tips for Home Buying, Selling &amp; 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