{"id":66414,"date":"2024-09-13T14:51:00","date_gmt":"2024-09-13T12:51:00","guid":{"rendered":"https:\/\/debesto.com\/en-us\/blog\/"},"modified":"2026-02-26T22:47:46","modified_gmt":"2026-02-26T21:47:46","slug":"thermal-performance-requirements","status":"publish","type":"post","link":"https:\/\/debesto.com\/en-us\/blog\/thermal-performance-requirements\/","title":{"rendered":"How to Ensure Your European Windows Meet US Thermal Performance Requirements?"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"299\" src=\"https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/26112254\/okno-tytul-2-1024x299.png\" alt=\"sun shining through the window\" class=\"wp-image-66479\" srcset=\"https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/26112254\/okno-tytul-2-1024x299.png 1024w, https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/26112254\/okno-tytul-2-300x88.png 300w, https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/26112254\/okno-tytul-2-768x224.png 768w, https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/26112254\/okno-tytul-2.png 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-medium-font-size\"><strong><strong>Thermal properties of windows and doors are crucial for the energy efficiency of buildings. The right choice of products can significantly reduce heating and cooling costs, as well as improve occupant comfort. <\/strong><\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong><strong>While NFRC certification is not always mandatory, it serves as a helpful benchmark for importing European windows to ensure compliance with US energy efficiency standards.<\/strong><\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Read this article so you can ensure your project meets thermal performance requirements<\/strong>!<\/p>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Table of content<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul style=\"background-color:#f9f9f9\" class=\"wp-block-list has-background\">\n<li><a href=\"#how-did-we-come-up\">How did we come up with the question?<\/a><\/li>\n\n\n\n<li><span style=\"text-decoration: underline\"><a href=\"#basic-thermal-properties\">Basic Thermal Properties of Windows and Doors<\/a><\/span><\/li>\n\n\n\n<li><span style=\"text-decoration: underline\"><a href=\"#certifications-and-standards\">Certifications and Standards<\/a><\/span><\/li>\n\n\n\n<li><span style=\"text-decoration: underline\"><a href=\"#regional-differences\">Regional Differences and State Thermal Requirements for Windows in US<\/a><\/span><\/li>\n\n\n\n<li><span style=\"text-decoration: underline\"><a href=\"#how-to-verify\">How to Verify the Thermal Properties of Windows and Doors?<\/a><\/span><\/li>\n\n\n\n<li><a href=\"#practical-examples\">Practical Examples of Energy Performance<\/a><\/li>\n<\/ul>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"wp-block-heading\" id=\"how-did-we-come-up\">How did we come up with the question?<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>We\u2019ve had multiple private clients from the US reach out, asking to get educated about imported European windows. Throughout our consultative process, we realized how little they knew about the US thermal performance requirements, often having their opinion based on a specific quote they received on the local market. The specification sheets they receive often describe values like the U-factor or SHGC, but what\u2019s more, they consider the values as legal requirements.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Circumstances we often face:<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A client provides us a quote from the local market stating different values, asking if we can meet them.<\/strong>\n<ul class=\"wp-block-list\">\n<li>We can easily meet or beat the values. The question is, should we?<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>A client considers these values legally required, asking us to make ours even.<\/strong>\n<ul class=\"wp-block-list\">\n<li>We\u2019re not really able to make them exactly the same, since the values are calculated for each construction individually. Still, the question remains. Should we?<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>A client approaches us asking for specific values they heard of, sometimes based on their architect&#8217;s or General Contractor&#8217;s opinion.<\/strong>\n<ul class=\"wp-block-list\">\n<li>This is often a good lead, although they might be sharing values which were not necessarily double-checked with the right entity.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:5%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer uag-hide-desktop uag-hide-tab\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1080\" height=\"1080\" src=\"https:\/\/cdn.debesto.com\/web\/assets\/2020\/04\/06090503\/debesto_business_consultants.jpg\" alt=\"video consultation with debesto\" class=\"wp-image-63258\" srcset=\"https:\/\/cdn.debesto.com\/web\/assets\/2020\/04\/06090503\/debesto_business_consultants.jpg 1080w, https:\/\/cdn.debesto.com\/web\/assets\/2020\/04\/06090503\/debesto_business_consultants-300x300.jpg 300w, https:\/\/cdn.debesto.com\/web\/assets\/2020\/04\/06090503\/debesto_business_consultants-1024x1024.jpg 1024w, https:\/\/cdn.debesto.com\/web\/assets\/2020\/04\/06090503\/debesto_business_consultants-150x150.jpg 150w, https:\/\/cdn.debesto.com\/web\/assets\/2020\/04\/06090503\/debesto_business_consultants-768x768.jpg 768w\" sizes=\"(max-width: 1080px) 100vw, 1080px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading\" id=\"basic-thermal-properties\">Basic Thermal Properties of Windows and Doors<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>U-Value<\/strong> \u2013 Measures how well a window insulates heat. The lower the value, the better the insulation.<\/li>\n\n\n\n<li><strong>Solar Heat Gain Coefficient (SHGC)<\/strong> \u2013 Measures how much solar radiation passes through the window. Important for regulating indoor temperature.<\/li>\n\n\n\n<li><strong>Air Leakage (AL)<\/strong> \u2013 Indicates the amount of air that passes through the window. Lower leakage means better airtightness.<\/li>\n\n\n\n<li><strong>Sound Transmission Class (STC)<\/strong> \u2013 Indicates the window\u2019s ability to reduce noise from outside. Higher STC means better sound insulation.<\/li>\n<\/ul>\n\n\n\n<p>If you are interested in more specific explanation of thermal properties, read our article about <a href=\"https:\/\/debesto.com\/en\/blog\/window-specification-europe-and-usa\/\">differences between US and EU specifications<\/a>!<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:5%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer uag-hide-desktop uag-hide-tab\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1000\" height=\"1067\" src=\"https:\/\/cdn.debesto.com\/web\/assets\/2023\/01\/06090953\/window-specs-used-in-the-usa-iconography-how-to-evaluate-the-quality-of-a-european-window.jpg\" alt=\"window specs used in the usa iconography\" class=\"wp-image-50481\" style=\"object-fit:cover\" srcset=\"https:\/\/cdn.debesto.com\/web\/assets\/2023\/01\/06090953\/window-specs-used-in-the-usa-iconography-how-to-evaluate-the-quality-of-a-european-window.jpg 1000w, https:\/\/cdn.debesto.com\/web\/assets\/2023\/01\/06090953\/window-specs-used-in-the-usa-iconography-how-to-evaluate-the-quality-of-a-european-window-281x300.jpg 281w, https:\/\/cdn.debesto.com\/web\/assets\/2023\/01\/06090953\/window-specs-used-in-the-usa-iconography-how-to-evaluate-the-quality-of-a-european-window-960x1024.jpg 960w, https:\/\/cdn.debesto.com\/web\/assets\/2023\/01\/06090953\/window-specs-used-in-the-usa-iconography-how-to-evaluate-the-quality-of-a-european-window-768x819.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-4 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"wp-block-heading\" id=\"certifications-and-standards\">Certifications and Standards<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>NFRC Certification<\/strong> (National Fenestration Rating Council) provides independent evaluations of thermal and other performance characteristics of windows and doors. Other important certifications include <strong>ENERGY STAR<\/strong> and <strong>CE<\/strong>, which also indicate high quality and energy efficiency.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-3 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"299\" src=\"https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/27093345\/loga-energy-1024x299.png\" alt=\"nfrc, ce and energy star logo\" class=\"wp-image-66541\" srcset=\"https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/27093345\/loga-energy-1024x299.png 1024w, https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/27093345\/loga-energy-300x88.png 300w, https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/27093345\/loga-energy-768x224.png 768w, https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/27093345\/loga-energy.png 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-5 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"wp-block-heading\" id=\"regional-differences\">Regional Differences and State Thermal Requirements for Windows in US<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Different states in the USA may have varying regulations regarding the thermal properties of windows and doors. For instance, California has stricter energy efficiency requirements, while Florida places more emphasis on hurricane resistance. Customers should check local building codes to ensure selected products meet all requirements.<\/p>\n\n\n\n<p>Here\u2019s an article you might find handy:<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.buildingsguide.com\/build\/building-codes-by-state\/\" target=\"_blank\" rel=\"noreferrer noopener\">Building Codes by State<\/a> &#8211; <\/strong>this resource offers a detailed overview of building codes for each state, including links to relevant state government websites where the latest building codes can be accessed. It covers a wide range of building aspects, including window specifications.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:5%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"728\" src=\"https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/23123054\/tabelka1.png\" alt=\"table of technical parameters of windows imported from europe\" class=\"wp-image-66429\" style=\"object-fit:cover\" srcset=\"https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/23123054\/tabelka1.png 1024w, https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/23123054\/tabelka1-300x213.png 300w, https:\/\/cdn.debesto.com\/web\/assets\/sites\/7\/2024\/08\/23123054\/tabelka1-768x546.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-6 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h2 class=\"wp-block-heading\" id=\"how-to-verify\">How to Verify the Thermal Properties of Windows and Doors?<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>The best sources of information are manufacturer websites and technical documentation, as well as debesto\u2019s website. NFRC labels provide key information that can be easily compared. It is also beneficial to use online tools, such as energy calculators, to assess the energy efficiency of a building after installing new windows or doors.<\/p>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"practical-examples\">Practical Examples of Energy Performance<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>For example, in a cold climate, it is important to choose windows with a low U-Factor to minimize heat loss. <\/p>\n\n\n\n<p>In a hot climate, a low SHGC is crucial to prevent overheating. <\/p>\n\n\n\n<p>Selecting the the right parameters can significantly improve both comfort and energy efficiency of the building.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:5%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"500\" height=\"408\" src=\"https:\/\/cdn.debesto.com\/web\/assets\/2023\/01\/06091121\/label2.jpg\" alt=\"nfrc label visualisation of energy performance\" class=\"wp-image-45895\" srcset=\"https:\/\/cdn.debesto.com\/web\/assets\/2023\/01\/06091121\/label2.jpg 500w, https:\/\/cdn.debesto.com\/web\/assets\/2023\/01\/06091121\/label2-300x245.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>As a person responsible for windows used in project, you should pay special attention to certifications and thermal properties of windows and doors. Checking local regulations and using available analysis tools will help make the best choice.<\/p>\n\n\n\n<p>Remember, whenever not certain, reach out to your local <strong>Building Council<\/strong> in order to receive the most recent and feasible requirements. <\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Is NFRC certification mandatory?<\/strong><br>It depends on where you\u2019re located. Generally speaking, not always, but it is very helpful in assessing the quality of windows and doors.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>What thermal properties are most important?<\/strong><br>U-Factor and Solar Heat Gain Coefficient (SHGC) are the key parameters.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Where can I find information about the thermal properties of products?<\/strong><br>On manufacturer websites and in product technical documentation. If you would like to be absolutely sure, our job is to find best solution which meets all of your requirements. <\/li>\n<\/ul>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<article class=\"post post--tile\">\n  <div class=\"post__image\">\n    <figure class=\"\">\n      <img decoding=\"async\" class=\"\" src=\"https:\/\/cdn.debesto.com\/web\/assets\/2022\/08\/06090507\/debesto-video-consultation.jpg\" alt=\"debesto video consultation\"\/>\n    <\/figure>\n  <\/div>\n  <div class=\"post__content\">\n    <h2><a href=\"https:\/\/debesto.com\/en-us\/quick-contact-form\/\" title=\"Book a project consultation\">Not sure if European windows will meet project requirements?<\/a><\/h2>\n        <p>You own a window project, but have doubts whether European windows are going to meet your expectations? Book a free video consultation!\r\n<\/p>\n        <a href=\"https:\/\/debesto.com\/en-us\/quick-contact-form\/\" class=\"btn btn--fill\" title=\"Book a project consultation\"><span>Book a project consultation<\/span><\/a>\n  <\/div>\n<\/article>\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Learn about key certifications, regional standards, and practical tips for selecting energy-efficient windows imported from Europe.<\/p>\n","protected":false},"author":46,"featured_media":66601,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[7],"tags":[],"class_list":["post-66414","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips","author-kai-adamek"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin 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