{"id":5133,"date":"2026-11-13T19:33:48","date_gmt":"2026-11-13T18:33:48","guid":{"rendered":"https:\/\/aristofenster.eu\/coefficient-uw-fenetre\/"},"modified":"2026-11-14T05:01:36","modified_gmt":"2026-11-14T04:01:36","slug":"coefficient-uw-fenetre","status":"publish","type":"post","link":"https:\/\/aristofenster.eu\/fr\/coefficient-uw-fenetre\/","title":{"rendered":"Le coefficient Uw d\u2019une fen\u00eatre expliqu\u00e9 : quelle isolation pour vos fen\u00eatres ?"},"content":{"rendered":"<p>En comparant des devis de fen\u00eatres, on rencontre partout des abr\u00e9viations comme <strong>Uw, Ug et Uf<\/strong>. La valeur la plus importante est le coefficient Uw : il indique la quantit\u00e9 de chaleur perdue \u00e0 travers la fen\u00eatre enti\u00e8re. Nous expliquons ce qui se cache derri\u00e8re ces chiffres, quels crit\u00e8res s\u2019appliquent et combien vous pouvez \u00e9conomiser avec de meilleures fen\u00eatres.<\/p>\n<h2>Que signifie le coefficient Uw ?<\/h2>\n<p>Le coefficient U (coefficient de transmission thermique) indique la quantit\u00e9 d\u2019\u00e9nergie, en watts, perdue par m\u00e8tre carr\u00e9 de paroi pour chaque degr\u00e9 d\u2019\u00e9cart de temp\u00e9rature entre l\u2019int\u00e9rieur et l\u2019ext\u00e9rieur. L\u2019unit\u00e9 est le W\/(m\u00b2.K). La r\u00e8gle : <strong>plus la valeur est basse, mieux la fen\u00eatre isole.<\/strong> Le \u00ab w \u00bb signifie \u00ab window \u00bb : le Uw d\u00e9crit donc la fen\u00eatre compl\u00e8te, avec cadre, vitrage et bord du vitrage.<\/p>\n<h2>Uw, Ug, Uf et Psi : les composantes<\/h2>\n<ul>\n<li><strong>Ug (glazing) :<\/strong> isolation du vitrage. Un double vitrage \u00e0 isolation renforc\u00e9e tourne autour de 1,1, un triple vitrage entre 0,5 et 0,7 W\/(m\u00b2.K).<\/li>\n<li><strong>Uf (frame) :<\/strong> isolation du cadre. Les profil\u00e9s PVC modernes atteignent environ 0,9 \u00e0 1,2 W\/(m\u00b2.K).<\/li>\n<li><strong>Psi (\u03a8) :<\/strong> pont thermique en bord de vitrage. Un intercalaire \u00ab warm edge \u00bb en mat\u00e9riau synth\u00e9tique au lieu de l\u2019aluminium r\u00e9duit cette perte.<\/li>\n<\/ul>\n<p>Le Uw est calcul\u00e9 \u00e0 partir de ces valeurs et de la part des surfaces. Les fabricants l\u2019indiquent g\u00e9n\u00e9ralement pour une fen\u00eatre de r\u00e9f\u00e9rence de 1,23 \u00d7 1,48 m. Les petites fen\u00eatres avec une forte part de cadre ont une valeur un peu moins bonne, les grandes souvent une meilleure.<\/p>\n<figure class=\"wp-block-image size-large af-gfx\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/aristofenster.eu\/wp-content\/uploads\/aristofenster-blog-coefficient-uw-comparatif-fr.png\" alt=\"Graphique : coefficients Uw d\u2019anciennes et de nouvelles fen\u00eatres avec le seuil des aides\" width=\"1200\" height=\"690\" loading=\"lazy\" \/><figcaption>Coefficients Uw compar\u00e9s \u2013 avec le seuil des aides \u00e0 la r\u00e9novation et le niveau passif.<\/figcaption><\/figure>\n<h2>Quelles exigences s\u2019appliquent ?<\/h2>\n<p>Elles d\u00e9pendent du pays. En France, les aides \u00e0 la r\u00e9novation, comme la prime CEE (fiche BAR-EN-104), exigent pour les fen\u00eatres <strong>Uw \u2264 1,3 W\/(m\u00b2.K) et Sw \u2265 0,3<\/strong>, ou Uw \u2264 1,7 W\/(m\u00b2.K) et Sw \u2265 0,36. En Allemagne, la loi sur la modernisation des b\u00e2timents (GModG) impose aussi un Uw de 1,3 W\/(m\u00b2.K) au maximum lors d\u2019un remplacement. Les maisons passives utilisent des fen\u00eatres autour de 0,8 W\/(m\u00b2.K) et moins. Les conditions des aides \u00e9voluent : renseignez-vous sur les dispositifs en vigueur avant de commander.<\/p>\n<div class=\"af-cta\" style=\"background:#073C61;color:#ffffff;padding:28px 32px;border-radius:6px;margin:36px 0;border-left:6px solid #FFCC00\">\n<p style=\"margin:0 0 8px;font-size:21px;line-height:1.35;font-weight:700;color:#ffffff\">Quel Uw pour vos fen\u00eatres ?<\/p>\n<p style=\"margin:0 0 18px;color:#e6eef4\">Nous calculons le Uw pour vos dimensions et vous montrons quelle option est la plus rentable.<\/p>\n<p><a href=\"https:\/\/aristofenster.eu\/fr\/contact\/\" style=\"display:inline-block;background:#FFCC00;color:#073C61;padding:13px 24px;font-weight:700;text-decoration:none;border-radius:4px;letter-spacing:.5px\">Demander conseil \u2192<\/a><\/div>\n<h2>Exemple : combien rapporte un meilleur Uw ?<\/h2>\n<p>Une maison individuelle compte 15 m\u00b2 de fen\u00eatres. Les anciennes fen\u00eatres en double vitrage ordinaire ont un Uw d\u2019environ 2,8, les nouvelles en triple vitrage 0,8 W\/(m\u00b2.K). L\u2019\u00e9cart de 2,0 W\/(m\u00b2.K) sur 15 m\u00b2 repr\u00e9sente 30 watts de pertes en moins par degr\u00e9 d\u2019\u00e9cart de temp\u00e9rature. Sur une saison de chauffe typique d\u2019Europe centrale, cela fait environ <strong>2 000 \u00e0 2 500 kWh de chauffage en moins par an<\/strong> \u2013 plusieurs centaines d\u2019euros selon le prix de l\u2019\u00e9nergie. S\u2019y ajoute le confort : la face int\u00e9rieure du vitrage reste plus chaude, il y a moins de courants d\u2019air et moins de condensation.<\/p>\n<p><em>Remarque : cet exemple est une estimation simplifi\u00e9e. L\u2019\u00e9conomie r\u00e9elle d\u00e9pend du b\u00e2timent, des habitudes de chauffage et des apports solaires.<\/em><\/p>\n<h2>Conseils pour votre devis<\/h2>\n<ul>\n<li>Demandez le Uw pour vos dimensions r\u00e9elles, et pas seulement pour la fen\u00eatre de r\u00e9f\u00e9rence.<\/li>\n<li>Regardez le Ug et l\u2019intercalaire warm edge : tous deux influencent directement le Uw.<\/li>\n<li>Un bon Uw n\u2019est utile que si la pose est \u00e9tanche. Pour en savoir plus, lisez notre article sur la <a href=\"https:\/\/aristofenster.eu\/fr\/pose-de-fenetres-ral\/\">pose RAL<\/a>.<\/li>\n<\/ul>\n<p>Nos fen\u00eatres PVC \u00e0 triple vitrage atteignent un Uw jusqu\u2019\u00e0 0,74 W\/(m\u00b2.K) (VEKA Softline 82 MD). Les d\u00e9tails figurent sur la page <a href=\"https:\/\/aristofenster.eu\/fr\/produits\/fenetres-pvc\/\">Fen\u00eatres PVC<\/a>. Nous expliquons les diff\u00e9rences entre vitrages dans <a href=\"https:\/\/aristofenster.eu\/fr\/double-ou-triple-vitrage\/\">Double ou triple vitrage<\/a>.<\/p>\n<div class=\"af-cta\" style=\"background:#073C61;color:#ffffff;padding:28px 32px;border-radius:6px;margin:36px 0;border-left:6px solid #FFCC00\">\n<p style=\"margin:0 0 8px;font-size:21px;line-height:1.35;font-weight:700;color:#ffffff\">Des fen\u00eatres performantes \u00e0 un prix juste<\/p>\n<p style=\"margin:0 0 18px;color:#e6eef4\">Envoyez-nous vos dimensions \u2013 nous \u00e9tablissons un devis avec les valeurs Uw exactes.<\/p>\n<p><a href=\"https:\/\/aristofenster.eu\/fr\/contact\/\" style=\"display:inline-block;background:#FFCC00;color:#073C61;padding:13px 24px;font-weight:700;text-decoration:none;border-radius:4px;letter-spacing:.5px\">Demander un devis \u2192<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Que signifie le coefficient Uw ? Nous expliquons Ug, Uf et Psi, les exigences pour les aides et montrons par un exemple l\u2019\u00e9nergie \u00e9conomis\u00e9e avec de nouvelles fen\u00eatres.<\/p>\n","protected":false},"author":6,"featured_media":4984,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[67],"tags":[],"class_list":["post-5133","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-conseils"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Coefficient Uw d\u2019une fen\u00eatre expliqu\u00e9 | Aristofenster<\/title>\n<meta name=\"description\" content=\"Le coefficient Uw expliqu\u00e9 : Ug, Uf et Psi, crit\u00e8res des aides (Uw \u2264 1,3, Sw \u2265 0,3) et \u00e9conomies d\u2019\u00e9nergie possibles avec de meilleures fen\u00eatres.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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